Question

Which of the following statements about histamine is not correct
A) It is bronchodilator
B) Large scale release of it may cause a fall in blood pressure
C) Large scale release of it may cause a fall in blood volume
D) Histamine leease contributes to the symptoms of anaphylaxis

Answer 1

Answer:

D) IS NOT CORRECT

Explanation:

HPOE IT HELP

Answer 2

Answer: The correct answer is (A) It is bronchodilator.

Explanation:

•Histamine is chemically classified as an amine, an organic molecule based on the structure of ammonia (NH3).
•It is formed by the decarboxylation (the removal of a carboxyl group) of the amino acid histidine.

•In man, particularly in asthmatics, histamine is a powerful bronchoconstrictor, due to the predominance of bronchoconstricting H1-receptors in the airways.

•Histamine produces the dilation of blood vessels, which increases permeability and lowers blood pressure.

•Anaphylaxis occurs when histamine-containing cells in the body are activated by an allergic trigger binding to allergic antibody (IgE) on the surface of the cell.
•These cells release large amounts of histamine and other allergic mediators which have widespread effects.