Question

question 3 (2.5 points)
expectorants are effective by

a) liquefying pulmonary secretions
b) increasing secretions and reducing their viscosity, although evidence of benefit is lacking
c) constriction of blood vessels in the respiratory tract
d) competitive antagonism of histamine1 receptor sites
e) cough suppression
question 4 (2.5 points)
which of the following medications is not an h2 blocker?

Explanation:

Expectorants work by increasing respiratory tract secretions and reducing their viscosity to help clear mucus. This mechanism differentiates them from other actions like blood - vessel constriction, histamine receptor antagonism, or cough suppression.

Answer:

B. increasing secretions and reducing their viscosity, although evidence of benefit is lacking