Homeostasis and thermoregulation

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Question 24

The diagram below shows the arrangement of blood vessels in the dermis of mammalian skin involved in thermoregulation.

Skin blood vessels

When a mammal is exposed to a cold environment, which of the following combinations correctly describes the state of Vessel $X$ , the state of Vessel $Y$ , and the effect on heat loss from the skin surface?

Vessel $X$ is dilated, Vessel $Y$ is constricted, and heat loss by radiation is increased.

Vessel $X$ is constricted, Vessel $Y$ is dilated, and heat loss by radiation is decreased.

Vessel $X$ is constricted, Vessel $Y$ is constricted, and heat loss by radiation is decreased.

Vessel $X$ is dilated, Vessel $Y$ is dilated, and heat loss by radiation is increased.

Homeostasis and thermoregulation Questions

GCSE
Biology
Homeostasis and thermoregulation

GCSE
Biology Edexcel
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