Answer:
Histamine
is a potent vasodilator.
(i) It contracts muscles in the gut and bronchi.
(ii) It relaxes some other muscles, e.g., in the walls of
blood vesels.
(iii) It is responsible for congestion in the nose
associated with common cold and allergies.
(iv) It stimulates the release of pepsin and HCl in the
stomach.
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