What causes vasoconstriction?

Dilation of blood vessels in the skin.

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Increased body heat.

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Air movements over the body.

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Broadening of blood vessels

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Solution

The correct option is B Increased body heat.
When the outside temperature is low, the blood vessels get narrowed. This is vasoconstriction. This reduces the blood supply to the skin as a result of which the heat loss is reduced. This is a natural method to conserve heat.

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