The Closure of a Precapillary Sphincter Prevents Blood Flow to Tissues

Question

The closure of a precapillary sphincter prevents blood flow to tissues from:
A)venules.
B)arterioles.
C)elastic arteries.
D)muscular arteries.

Accepted Answer

Arterioles are the vessels that lead to capillaries, and precapillary sphincters are located at the beginning of capillaries. Therefore, the closure of a precapillary sphincter prevents blood flow to tissues from the arterioles. Venules, elastic arteries, and muscular arteries are not involved in the regulation of blood flow through the capillary bed.