What causes vasoconstriction?

Dilation of blood vessels in the skin

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Cold outside temperature

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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
Cold outside temperature

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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Similar questions

Regarding assertion and reason, choose the correct option_______.
Assertion [A]: Cold air causes vasodilation of blood vessels in the nasal cavity.

Reason [R]: Oxygen can be absorbed by widened blood vessels.

When the environmental temperature is low, our blood vessels constrict, minimising blood flow near the skin.

Which layer of skin contains blood vessels?

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