Question

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which happens when the temperature of the skin increases?
the arterioles dilate and reduce blood to the skin.
the arterioles dilate and increase blood flow to the skin.
the arterioles constrict and reduce blood to the skin.
the arterioles constrict and increase blood flow to the skin.

Explanation:

When the skin temperature increases, the body's thermoregulatory mechanism kicks in. Arterioles (small blood vessels) dilate (widen). This dilation allows more blood to flow to the skin's surface. The increased blood flow helps in dissipating heat (through processes like radiation, conduction, convection, and evaporation of sweat if present). If arterioles constricted, blood flow to the skin would be reduced (which is what happens when the body wants to conserve heat, like in a cold environment).

Answer:

The arterioles dilate and increase blood flow to the skin.