Answer:
The correct answer is - A. All of the answers are correct.
Explanation:
Mast cells are the cells that are present on connective tissue. These cells have many garnules that are filled with histamin and heparin that play role in first line immune response against allergens. Degranuation is the process of releasing these granules.
Other than this mast cells or mastocytes also secrete lipid mediators and cytokines. These are activated and secreted in presence of allergen or anaphalyxis response.
difference between action potential of sa node and contractile myocytes​
Different groups of cells depolarize at different rates. The rate of depolarization of SA node cells is faster than the rate of depolarization of AV node cells. ... If both the SA node and AV node fail, the Purkinje fibers have a modest level of automaticity (20 beats/minute) that may still reach threshold