The CD4 receptors on a helper T cell are attracted to: A. GP 120 in HIV.
What is HIV?In Medicine, HIV is an abbreviation for human immunodeficiency virus and it can be defined as a type of venereal disease that gradually destabilizes, weakens, and destroys the immune system of an infected patient.
This ultimately implies that, human immunodeficiency virus (HIV) and acquired immune deficiency syndrome (AIDS) are a type of diseases that makes it practically impossible for antigens to effectively and efficiently combat pathogens in the body of a living organism, thereby, making the CD4 receptor susceptible and prone to the human immunodeficiency virus (HIV).
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Complete Question:
The CD4 receptors on a helper T cell are attracted to.
multiple choice
A. GP 120 in HIV. B. GP 41 in HIV. C. Ero 1 in HIV. D. p17 in HIV.
place each choice in its correct position on the typical multipolar neuron in the figure. place the anatomical names of neuron structures above the neuron. place the events that occur at the bracketed locations below the neuron.
Multipolar neurons are neurons from the central nervous system. They are composed of an ovoid cell body with several dendrites emerging from it, a long axon, and axon terminals. Graded potential occurs in the neuronal soma, while action potential occurs in the axon.
What is a multipolar neuron?
Neurons are formed in general by
A cellular body, soma,Dendrites, which are cytoplasmic extensions that receive stimuli from other cells, and An axon, which is a long formation capable of conducting the electrochemical signals.
Multipolar neurons are the ones that have a single axon and several dendrites.
Dendrites emerge from an ovoidal soma, and extend in different directions, creating a net and increasing the neuronal area to receive stimuli.
Axons are very large and covered by Schwann cells, facilitating impulse transmission.
These neurons are usually located in the central nervous system and integrate information coming from other nerve cells.
Every neuron forms connections with other neurons. These connections are known as synapsis.
As it happens in every synapsis between neurons when a presynaptic neuron sends information, a neurotransmitter is released.
Neurotransmitters are chemical substances that travel through the synaptic cleft to the junctional area of the other neuron and bind to its receptors in the postsynaptic membrane.
This binding produces a depolarization of the cell called an excitatory postsynaptic potential.
Graded potential initiates in the soma and dendrites.An action potential is initiated in the axon and spreads to the rest of the membrane depolarizing it.
In the image,
Anatomical names from the left to the right: dendrite, body cell, initial segment of the axon, axon, axon terminals.Events from the left to the right: graded potential, action potential.You can learn more about multipolar neurons at
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What would happen to a cell that didn’t replicate its dna before cell division?
The cell will not proceed with the further processes.
What is equational division?
Chromosome replication and equal distribution between the two daughter cells occur during the cell division process known as mitosis. Each daughter cell has the same number of chromosomes as the parent cell, making them diploid. Thus, mitosis is also referred to as equational division.
Unequal division will result if the cell didn't replicate prior to actually cell division. As a result of the checkpoints, it won't move on to the next step. The checkpoint will later start the apoptosis process, which results in programmed cell death.
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The hydrogen ions released by the dissociation of carbonic acid are buffered by their A) transport into the erythrocyte as sodium ions move out. B) transport out of the erythrocyte as a sodium ion moves in. C) active transport out of the erythrocyte. D) binding to DNA within the nucleus. E) binding to hemoglobin.
The hydrogen ions released by the dissociation of carbonic acid are buffered by their transport into the erythrocyte as sodium ions move out option A is correct.
what are hydrogen ions?
A hydrogen ion is a positively charged molecule as a result of it loosing an electron. Which is also the nucleus of a hydrogen atom separated from its accompanying electron.
what is erythrocyte ?
literally it is referred to as Red blood cell, red blood corpuscles, haematids, erythroid cells etc. This is also type of blood cell that is made in the bone marrow and found in the blood. Erythrocytes contain a protein
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the theory of endosymbiosis and history of life on earth allows one to predict that the gene sequences that are responsible for encoding functional, mitochondrial ribosomes in a particular tree likely share many similar nucleotides in the sequences from the ribosomal genes of other plant species bacterial species other tree species
The theory of endosymbiosis and the history of life on earth allows one to predict that the gene sequences that are responsible for encoding functional, mitochondrial ribosomes in a particular tree likely share many similar nucleotides in the sequences from the ribosomal genes of other bacterial species (Option II).
What is the theory of endosymbiosis?The theory of endosymbiosis is a model to explain the origin of eukaryotic cells, which postulates that these types of organisms evolved as a consequence of symbiotic relationships between primitive bacterial cells that converted into mitochondria and chloroplasts in animals and plants.
Therefore, with this data, we can see that the theory of endosymbiosis is based on the scientific idea that eukaryotic cells as observed in plants and animals generated due to symbiosis with primitive bacterial cells that entered into the cell and performed cellular respiration and photosynthesis.
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Give the number of protons electrons and neutrons in neutral atoms of each of the following isotopes.
Each of the above isotopes has, in turn, the following numbers of protons, electrons, and neutrons:
a) : 5,5,5\s
b) : 80,80,119
c) : 29,29,34
d) : 6,6,7\s
e) : 34,34,43
It is referred to be an element if all of its atoms have a distinct number of neutrons despite having the same amount of protons.
Atomic number = amount of protons x number of electrons
Mass number minus proton count equals the amount of neutrons.
Number of protons, electrons, and neutrons calculation.
(a) Nuclear number is 5.
There are 5 protons.
There are five electrons.
Atomic weight is 10
Atomic number - proton count equals the amount of neutrons.
Neutron count is equal to 10 – 5 = 5.
(b) Atomic weight is 80.
80 is the proton count.
Electron count is 80.
Atomic weight is 199.
Atomic number - proton count equals the amount of neutrons.
Neutron count is equal to 199 − 80 = 119.
(c) Nuclear number is 29.
There are 29 protons.
There are 29 electrons.
Atomic weight: 63
the quantity of neutron.
(Give the number of protons, electrons, and neutrons in neutral atoms of each of the following isotopes:
(a) 10,5 B
(b) 199,80 Hg
(c) 63,29 Cu
(d) 13,6 C
(e) 77,34 Se)
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Place the following events of a reflex arc in the correct order 1) motor neuron activation 2) sensory neuron activation 31 sensory receptor activation 4) information processing 5) effector response
a. 4.3.1.2.5 b. 1.5.3.2.4 c. 3.2, 1.5,4 d. 2,3,4,5, 1
e. 3.2, 4.1.5
The event of a reflex arc in correct order 3,2,4,1,5
( sensory receptor activation, sensory neuron activation, Information processing, motor neuron activation and effector response)
The neural pathway that is followed by a reflex response is called the reflex arc. The reflex arc is demonstrated by what occurs when we unintentionally contact something hot. The receptor is the first to notice a change in temperature. The relay neuron, which is located in the spinal cord, is then delivered electrical impulses. Motor neurons are linked to sensory neurons by these latter. The motor neuron transmits electrical impulses to an effector. The effector produces a reaction.
Hence, the neural system that triggers a reflex action is known as the reflex arc.
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Cells that have absorbed melanin to distribute pigmentation to other cells are located in what layer of the skin?.
Answer:
k
Explanation:
Design a Device That Minimizes the Force on an Object During a Collision
In this project, you will design, evaluate, and refine a device that minimizes the force
on an object during a collision. You should apply scientific ideas to develop your
device and try to avoid unanticipated effects. Apply the law of conservation of linear
momentum to the situation in which your device should be used, and compare the
velocities and momenta of objects in the system. Note that the total momentum of a
system can change, but the change is balanced by the momenta of objects outside
the system. In your design, you should specify any criteria and constraints, such as
limiting risk. You should be able to quantify how your design satisfies these criteria
and constraints. You may have to break down complex criteria into simpler ones and
prioritize certain criteria over others.
Background
An object's momentum is based on the mass and velocity of the object. The more
momentum the object has, the harder it is to stop the object or change its direction.
The equation for momentum is p = my, where p is momentum, mis mass, and vis
velocity. When a force is applied to an object, the object's velocity changes.
Answer: W h a t
Explanation: confusion
if you have a choice of what you are going to hit in a crash, hit the object ___________
if you have a choice of what you are going to hit in a crash, hit the object the least force.
What is force ?
Force is either pushing or pulling of any object resulting from the object’s interaction or movement, without force the objects can not be moved, can be stopped or change the direction.
It is a quantitative interaction between two physical bodies, means an object and its environment, there are different types of forces in nature.
If an object in its moving state will be either static or motion, the position of the object will only be changed if it is pushed or pulled and The external push or pull upon the object called as Force.
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the triads of a muscle fiber consist of __________.
A triad is made up of three notes stacked in subsequent thirds. A triad is also known as a harmony or a chord. (Chord progressions are another example of harmony.) The root is the lowest note of a triad when it is stacked in thirds.
What the triads of a muscle fiber posses?The terminal cisterna, T-tubule, and sarcoplasmic reticulum are the three structures that surround the myofibrils and make up the triad.
Therefore, Actin and myosin, two protein structures, are found in the myofibrils. In a muscle cell, the sarcomere serves as a structural and functional unit.
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electrons excited in photosystem ii help the chloroplast produce
As excited electrons move through the electron transport chain, NADPH is created.
The photosystem II's source of the excited electrons is what?A chlorophyll molecule's excited electron is moved to the an electron acceptor at the reaction center.It's an oxidation-reduction reaction right now.An electron from water is used in photosystem II to replace the electron lost from the reaction center.
What is produced during photosynthesis by photosystem 2?In oxygenic photosynthetic organisms, photosystem II is the first membrane protein complex.It uses light energy to catalyze the oxidation of water, which results in the production of atmospheric oxygen.
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sexual reproduction in humans .group of answer choicesallows a haploid sperm cell to fertilize a haploid egg cellproduces a haploid individualproduces an individual with 23 chromosomescombines two diploid gametes, producing a zygote
Sexual reproduction in humans is A. allows a haploid sperm cell to fertilize a haploid egg.
The human reproductive system occurs through the fertilization process, namely the meeting of male gametes and female gametes. The fertilization process will produce a zygote, the zygote then undergoes embryonic development until it is born as a child.
The fertilization process begins with the maturation of the egg and spermatozoa. During ovulation, the spermatozoa penetrate the corona radiata until the sperm attaches to the zona pellucida. When the spermatozoa successfully penetrate the zona pellucida, oocyte fusion will occur. Haploid sperm cell to fertilize the haploid egg. The union of the ovum and spermatozoa triggers the start of mitotic division which will produce up to 32 cells called morula which will develop into a blastocyst.
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desert pupfish live in springs of the american southwest. today, there are about 30 species of pupfish, but they all evolved from a common pleistocene ancestor. the southwestern united states was once much wetter than it is now, and the pleistocene pupfish flourished over a wide geographic area. over thousands of years, however, the sierra nevada mountain range was pushed upward by geological forces, blocking rainfall from the pacific ocean. as the large lakes dried up, small groups of pupfish remained in springs and pools fed by groundwater seepage. now, although many of these small springs still have pupfish, each population, through evolution, has become very different from populations of pupfish in other springs.
The isolated populations had restricted gene pools.
Evolution is alternate in the heritable traits of biological populations over successive generations. Those traits are the expressions of genes, which are passed on from figure to offspring in the course of reproduction. Evolution is crucial as it explains how existence developed on this planet and how specific species are connected.
Many scientists trust that RNA, or something much like RNA, became the primary molecule on the earth to self-reflect and start the process of evolution that led to extra advanced sorts of lifestyles, such as human beings.
Homo sapiens or modern guys emerged 250000 years ago. The evolution of human beings has taken around 5 million years.
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three babies were recently mixed up in a hospital. based on the data in the table above, the couple with blood types a and b are the actual parents of the child with blood type
Based on the data of blood types for both the couple and the babies, baby #3 with blood type AB belongs to Couple II with blood type A and B.
Why is Blood type important?Certain antigens are substances that can trigger an immune response that are considered foreign to the body. These antigens are found in blood types that determines its presence or absence.
In order for medical situations such as blood transfusion to successfully occur, blood type matching is needed. Blood type plays other important roles in genetics that include matching to identify parentage as is the case of the question where the baby with AB can only come from the parents with A and B blood type.
The full question is:
Three babies were mixed at the hospital. Given the data below, the couple with blood types a and b are the actual parents of the child with blood type?
COUPLE # I II IIIBlood type A&A A&B B&OBABY # 1 2 3Blood type B O ABLearn more on blood type here: https://brainly.com/question/15289194
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unlike b lymphocytes, t lymphocytes do not generate a secreted form of their antigen receptors
Self-reactive antigen receptors may be produced by the random process that produces lymphocyte antigen receptors.Several of these possibly self-reactive lymphocytes are removed during lymphocyte development,
Why does the antigen receptor exist?It serves as a receptor that identifies and binds antigen through the exposed V regions on the cell's surface, sending a signal that activates B cells, triggering clonal growth and the production of specific antibodies.
Describe the three antigen receptors?A co-receptor complex made up of at least three cell-surface molecules—CD19, CD21, and CD81—modifies the signaling of B-cell antigen receptors.
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classify each mutation example as definitely positive, definitely negative, or most likely neutral. each category has two examples. you are currently in a sorting module. turn off browse mode or quick nav, tab to items, space or enter to pick up, tab to move, space or enter to drop. beneficial mutations neutral mutations harmful mutations answer bank
A beneficial mutation is one that has a good effect on an organism. These mutations are uncommon yet important. The benefit that a beneficial mutation provides the organism is passed down from generation to generation, increasing the chances of survival for the offspring.
Neutral mutations:
Neutral mutations are changes in DNA sequence that are neither beneficial nor harmful to an organism's ability to survive and reproduce. In population genetics, neutral mutations are mutations in which natural selection has no effect on the spread of the mutation in a species.
Harmful mutations: Mutations that are harmful can result in genetic diseases or cancer. A genetic condition is an illness that results from a mutation in one or more genes. Cystic fibrosis is a human example. A single gene mutation causes the body to produce thick, sticky mucus, which clogs the lungs and blocks ducts in digestive organs.
What is mutation?
A mutation is a change in an organism's DNA sequence. Mutations can occur as a result of errors in DNA replication during cell division, mutagen exposure, or viral infection.
What causes mutation?
Mutations can occur as a result of mistakes in DNA replication during cell division, mutagen exposure, or viral infection. Germline mutations (those that occur in eggs and sperm) can be handed on to offspring, but somatic mutations (those that originate in body cells) cannot.
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Full Question: Classify each mutation example as definitely positive, definitely negative, or most likely neutral. Each category has two examples.
which bones unite to form the highlighted bone?
The highlighted bone is named the sternum. The sternum, which lies in the middle of the chest, is where the ribs connect to the body.
Which joint does the humerus's highlighted bone form?The humeral head's ball and glenoid's socket connect at the glenohumeral joint. The supraspinatus, infraspinatus, teres minor, and subscapularis muscles' tendons make up the rotator cuff, which joins the humerus to the scapula. Muscle and bone are joined via tendon.
What develops in the indicated curvature?When a child is able to sit up on their own, the lumbar curvature that is highlighted begins to develop. The structure in bold allows for head lateral rotation. The structure in bold allows for head lateral rotation.
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Which is not true about all
of these elements?
Answer:
A. They are all in the same group B. They all have the same number of valence electrons C. They all have the same number of protons D. They all share similar properties
Explanation:
what feature of fats makes them hydrophobic
outline the process of transcription in the nucleus including the
Initiation, elongation, and termination are the three steps of transcription that are depicted here. Initiation, elongation, and termination are the three stages of transcription.
What are the four steps in the transcription process?The process of copying DNA to create a complementary strand of RNA is called transcription. After that, RNA is translated to become proteins. Initiation, promoter removal, elongation, and termination are the four main phases of transcription.
In what transcription does the nucleus engage?Transcription takes place in the cell's nucleus since the genes are bound there, but the mRNA transcript needs to be delivered to the cytoplasm. In prokaryotes, which include bacteria and archaea, transcription takes place in the cytoplasm of the cell since these organisms lack organelles and membrane-bound nuclei.
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art-labeling activity main nerves of the brachial plexus
The art-labeling activity main nerves of the brachial plexus is given in the image attached.
How many nerves does the brachial plexus have?There are five main nerve branches that branch off from the brachial plexus and travel down the arm: cutaneous nerve of the muscles: flexes muscles in the upper arm at the shoulder and elbow and originates from nerve roots C5 to C7.
The radial, musculocutaneous, median, ulnar, and axillary nerves are the brachial plexus' five terminal branches.
Note that the network of nerves called the brachial plexus is what carries signals from the spinal cord to the shoulder, arm, and hand. A brachial plexus injury happens when these nerves are compressed, stretched, or in the most severe scenarios, torn apart or severed from the spinal cord.
Therefore, one can say that for the motor and sensory innervation of the upper extremities, including the shoulder, arm, and hand, the brachial plexus is said to be a significant network of nerves that transmits signals.
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Which of the following are secondary sexual characteristics?
A
Growth of facial hairs in boys
B
Acnes in both boys and girls
C
Mammary glands in girls
D
All of the above
Characters with secondary sexual characteristics include those with facial hair, development of the breasts, chest hair beneath the arms, beards, and mustaches.
Which of these traits is secondary to sexuality?In humans, obvious secondary sex traits include pubic hair on both sexes, larger breasts and expanded hips in women, facial hair and Adam's apples on men.
What are the secondary sexual traits of men?Secondary characteristics of males include the ability to gain muscle mass more quickly than females, more body hair, pelvic build (lack of rounded hips), facial and chest hair, and increased body hair.
Girls' voices get harsh during puberty, whereas boys' voices go hoarse.
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Maltase is an enzyme that is not able to catalyze the synthesis of lipids because maltase.
Due to its unique active site, the enzyme maltase is unable to catalyze the production of lipids. One enzyme that particularly reacts with maltose is called maltosease (a sugar molecule). Because maltase has a unique active site, it is an enzyme that cannot catalyze the creation of lipids.
The biological molecules known as enzymes serve as catalysts in living things. They have a proteinoid makeup. The following characteristics of enzymes are listed The processes that enzymes catalyze do not affect them in any way. Enzymes work on particular substrates because they are substrate-specific. pH and temperature catalyze affect how well enzymes work.
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arginase, a key enzyme in liver urea production, requires four ____ atoms per molecule. group of answer choices iron copper zinc manganese
Ceruloplasmin is one illustration; it has eight copper atoms per molecule. Copper and zinc provide as examples of the needs for and toxicity of important trace elements.
What trace mineral is necessary for gluconeogenesis' primary enzyme to be activated?Manganese is a trace mineral that functions as a cofactor for enzymes that produce urea, cholesterol, and glucose (gluconeogenesis) (amino-acid catabolism in the liver).
Which Micromineral is deemed crucial for healthy brain function?The liver, kidney, pancreas, and bones are where manganese is primarily deposited. and contributes to the regulation of blood sugar, calcium absorption, and fat and carbohydrate metabolism. For healthy nerve and brain function, manganese is also essential.
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which of the boxes marked 1-4 correspond to plants that will be true-breeding?
The boxes marked 1-4 correspond top plant that will be true breeding is 1 and 4 only. The correct option is A).
What is true breeding?True breeding is a sort of breeding in which the parents generate kids with the same phenotype. This signifies that both parents are homozygous for all of the traits.
Aberdeen Angus cattle are an example of real breeding. True-breeding plants have the same genetic make-up for the character(s) under investigation. Pure breeds exhibit no variation and pass down the same qualities for numerous generations after self-pollination.
Therefore, the correct option is A) 1 and 4 only.
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The question is incomplete. Your most probably complete question is given below:
A) 1 and 4 only. B) 2 and 3 only. C) 1, 2, 3, and 4. D) 1 only.
Part a. A plate inoculated with a sample volume of 10^-7 mL produced 170 colonies. What was the original concentration in the sample? Show work.Part b. After incubation, how many colonies should be on the 10^-8 mL plate from the dilution series in Part a? Show work.Part c. After incubation, how many colonies should be on the 10^-6 mL plate from the dilution series in Part a? Show work.
the serial dilution, solution for the original concentration in the sample is 170 colonies, solutions are A-10^-7 mL=1.7 x 10^9 cfu/mL
After incubation, 10^-8 mL x 1.7 x 10^9 cfu/mL= 17 colonies should be on the 10^-8 mL plate from the dilution series in Part a , c-10^-6 mL x 1.7 x 10^9 cfu/mL= 1700 colonies. Serial dilutions are created by repeating the same dilution step, with the previous dilution serving as the input to the next dilution in each step. The dilutions are a geometric series because the dilution-fold is the same in each step (constant ratio between any adjacent dilutions). A small amount of a well-mixed solution is transferred into a new container, and more water or other solvent * is added to dilute the original solution. The diluted sample is then used as the base solution for further dilution.
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in a study of the forces involved when motor proteins
Motor proteins also produce force locally within the network of cytoskeletal polymers, which transmits these forces to determine the shape of each cell and, ultimately, the architecture of tissues and whole organisms. Chapters 37 to 39 and 44 illustrate how motors move cells and their parts.
Assuming ri, r2 are negative constants and that $1,2, and $2,1 are positive constants, what do the following equations represent? 1 dN1 = ri + $1,2N2 Ni dt 1 dN2 = r2 + 82,1N1 N2 dt a. Competition b. Predation c. Facultative mutualism d. Obligate mutualisme.
Assuming a, r2 are negative constants and that $1,2, and $2,1 are superb constants choice D obligates mutualism.
D. Obligate mutualisme.
crosses x-axis --> 1 species relies upon on the alternative/ negative population increase at some unspecified time in the future.
The negative constant time period is n. If n is wonderful, the graph of a line with slope m intersects the y-axis above the starting place at (0, n) If n is bad, the graph of a line with slope m intersects the y-axis under the foundation, at (0, n). The phrase "tremendous linear feature" isn't used.
The regular can be high quality or negative. If for a few purposes we already know it is able to simplest have values such as 1 and –1, we may say it equals ±1. Mathematical symbols are used mostly for comfort they do not make anything greater correct.
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many people believe that taking zinc lozenges reduces the severity and duration of the common cold. sebastien decides to conduct a study at his school to explore this claim. he sends a survey to a simple random sample of 100 students, asking them to if they took zinc lozenges or not during their last cold, and how long they experienced cold symptoms. he found that students who took zinc had a mean cold duration that was 1.2 days lower than those who did not take zinc. which of the following statements about his study is true?
Sebastien's study is subject to confounding.
What are zinc lozenges?
A well-liked remedy for the common cold is zinc. According to some studies, zinc lozenges may shorten colds' duration by one or two days and may lessen the incidence of upper respiratory infections. Zinc aids in wound healing and infection prevention. Treatment of the common cold with zinc gluconate lozenges, using adequate doses of elemental zinc, may be effective in reducing the duration and severity of cold symptoms. If the lozenges are started as soon as symptoms appear, the benefit seems to be at its greatest. The formulation of the lozenges also appears to be important because the addition of citric acid or tartaric acid may reduce efficacy due to the chelation of zinc ions.
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Drag each label into the appropriate position to identify whether the statement depicts something true or false about the specimen pictured below: - contains connective tissues- visible directional orientation of collagen fibers- found in areas where bones are joined via cartilage- same tissue category as blood- a larger portion of extracellular matrix to cells- functions to resist shock; - seen in tendons
- contains dense irregular connective tissue
- contains a perichondrium
- chondrocytes in clusters of 3-4 arranged in clumps
TRUE Statement
- contains connective tissues
- visible directional orientation of collagen fibers
- found in areas where bones are joined via cartilage
- same tissue category as blood
- a larger portion of extracellular matrix to cells
- functions to resist shock
FALSE Statement
- seen in tendons
- contains dense irregular connective tissue
- contains a perichondrium
- chondrocytes in clusters of 3-4 arranged in clumps
What is perichondrium?
The cartilage of growing bones is surrounded by a layer of dense, wavy connective tissue called the perichondrium. It is made up of an inner chondrogenic layer and an exterior fibrous layer. Fibroblasts in the fibrous layer create collagenous fibers. The chondrogenic layer can produce chondroblasts and is yet undifferentiated. Both hyaline cartilage and elastic cartilage have perichondrium at their edges.
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