Question

on a hot summer day, ethan goes for a run and his body temperature becomes abnormally high. thermoregulatory homeostasis is maintained by a decrease in blood flow to the skin and sweat gland activity an increased blood flow to the skin and decrease in sweat gland activity an increase in sweat gland activity and blood flow to the skin. an increase in sweat gland activity and a decrease in blood flow to the skin

Explanation:

To maintain thermoregulatory homeostasis when body temperature is high, the body needs to cool down. Increased blood flow to the skin helps transfer heat from the body to the environment (as blood carries heat). Increased sweat gland activity produces sweat, which evaporates and cools the body. Let's analyze each option:

• Option A: Decreased blood flow to skin would retain heat, and decreased sweat gland activity would not help cool, so incorrect.
• Option B: Decreased sweat gland activity would not aid cooling, so incorrect.
• Option C: Increased blood flow to skin (transfers heat) and increased sweat gland activity (evaporative cooling) are correct mechanisms for cooling.
• Option D: Decreased blood flow to skin retains heat, so incorrect.

Answer:

C. An increase in sweat gland activity and blood flow to the skin.