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1. Regarding the role of blood in the regulation of body temperature, which is the correct concept?

A. Peripheral vasodilation to raise body temperature
B. Increased flow to visceral organs for cooling
C. Peripheral vasoconstriction to reduce heat loss
D. Increased flow to peripheral vessels on a cold day

2. Which of the following conditions stimulate thirst?

E. None of the above

Answer :

Final answer:

Peripheral vasoconstriction reduces heat loss, while peripheral vasodilation promotes heat loss.


Explanation:

The correct concept regarding the role of blood in the regulation of body temperature is Peripheral vasoconstriction to reduce heat loss. When the body needs to conserve heat, the blood vessels in the skin constrict, reducing blood flow to the surface and minimizing heat loss. This mechanism occurs during exposure to cold temperatures. In contrast, peripheral vasodilation increases blood flow to the skin, promoting heat loss. Increased flow to visceral organs is not related to cooling or regulation of body temperature.


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