Question

question 12 (2.5 points) expectorants are effective by _. a) cough suppression b) competitive antagonism of histamine1 receptor sites c) liquefying pulmonary secretions d) constriction of blood vessels in the respiratory tract e) increasing secretions and reducing their viscosity, although evidence of benefit is lacking

Explanation:

Expectorants work by increasing respiratory tract fluid secretion and reducing the viscosity of mucus, making it easier to cough up. Cough - suppressants are for suppressing coughs, anti - histamines act on histamine receptors, and blood vessel constriction is not their main mechanism.

Answer:

e) increasing secretions and reducing their viscosity, although evidence of benefit is lacking