Homeostasis-2

The diagram shows a capillary loop in the skin of a mammal.

What will the capillary loop look like if the mammal becomes cold?

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What would be the effects of vasodilation and sweating on the body temperature and on the amount of moisture on the surface of the skin?

• A

• B

• C

• D

During a long race, an athlete’s skin temperature rises. What causes this?

• A increased sweating

• B opening of the pores in the skin

• C vasoconstriction of the blood vessels in the skin

• D vasodilation of the blood vessels in the skin

Read the following sentence. In order to prevent the human body from losing heat, the arterioles supplying the skin become narrow.

Which process does this sentence describe?

• A constriction

• B shivering

• C sweating

• D vasodilation

When the body temperature rises above 37 °C, which changes help to return the temperature to normal?

• A

• B

• C

• D