Differentiate between the chemical mediators that are formed and released from injured tissue,mast cells,and leukocytes in the respiratory tract,and select the function of histamine as it relates to asthma.
A) Histamine causes bronchoconstriction, increased vascular permeability that contributes to mucosal edema, and infiltration of leukocytes.
B) Histamine causes bronchodilation, decreased vascular permeability that contributes to mucosal edema, and infiltration of leukocytes.
C) Histamine is released from eosinophils and mast cells and functions to attract
D) eosinophils to the site of cell injury or irritation.
E) None of these are correct.
Correct Answer:
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