Question

which is administered within a few hours after a heart attack or stroke to dissolve the damaging blood clots?
a. vasoconstrictor
b. tissue plasminogen activator
c. aspirin
d. nitroglycerin

Explanation:

Tissue plasminogen activator (t - PA) is a thrombolytic agent. It works by converting plasminogen to plasmin, which can dissolve blood clots. Vasoconstrictors constrict blood vessels and are not for clot - dissolution. Aspirin inhibits platelet aggregation but is not as effective as t - PA in rapidly dissolving existing clots. Nitroglycerin is mainly used for vasodilation to relieve angina, not for clot - dissolution.

Answer:

B. tissue plasminogen activator