Question

vasoconstriction in blood vessels is controlled by the vasomotor center in the ________ of the brain.
a pons
b cerebellum
c hypothalamus
d medulla oblongata

Explanation:

The vasomotor center, which controls vasoconstriction (and vasodilation) in blood vessels, is located in the medulla oblongata. The medulla oblongata is a part of the brainstem and is responsible for many autonomic functions including regulating blood vessel diameter. The pons is involved in functions like sleep - wake cycles and respiration modulation. The cerebellum is mainly for motor control, balance, and coordination. The hypothalamus is crucial for regulating body temperature, hunger, thirst, and endocrine functions but not the vasomotor center.

Answer:

D. medulla oblongata