Question

Which of these statements about arteriovenous shunts in the skin is true?

A. They divert blood to superficial capillary loops
B. They are closed when the ambient temperature is very low
C. They are closed when the deep-body temperature rises much about 37 degrees
D. All of these are true

Answer 1

Arteriovenous shunts in the skin divert blood to superficial capillary loops when the ambient temperature is warm, and they close when the ambient temperature is very low or the deep-body temperature rises much above 37 degrees.

Step-by-step explanation:

The correct answer is D, All of these are true.

Arteriovenous shunts in the skin play an important role in regulating body temperature. When the ambient temperature is warm, these shunts divert blood to superficial capillary loops, allowing heat to be dissipated to the environment. On the other hand, when the ambient temperature is very low or the deep-body temperature rises much above 37 degrees, the arteriovenous shunts close, redirecting blood deeper into the body where it can help retain heat.