Thermoregulation response to heat exposure

Steps:

• Body's hypothalamus detects rising core temperature from hot room.
• Activates sweating to promote evaporative cooling and heat loss.
• Triggers vasodilation of skin blood vessels to increase blood flow and radiate heat.
• These changes restore thermal balance via negative feedback.

Why C is correct:

• In thermoregulation, heat stress increases sweating for evaporation and dilates skin vessels to enhance convective heat loss, per homeostatic principles.

Why the others are wrong:

• A: Both changes oppose cooling; constriction retains heat, sweating decrease reduces evaporation.
• B: Sweating decrease hinders cooling despite dilation aiding heat loss.
• D: Vasoconstriction retains heat, countering the cooling effect of increased sweating.

Final answer: C