PATHOLOGY MCQ
SKIN
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The blood vessels in your skin constrict, reducing blood flow to cool the body
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The blood vessels constrict to increase blood flow to cool the body
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The blood vessels dilate to increase blood flow to the skin
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The blood vessels dilate to decrease blood flow to the skin
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Detailed explanation-1: -The blood vessels are dilated so more blood flows near and at the surface of your body to allow heat to be lost to the air. The smallest blood vessels, the capillaries, also dilate and this makes your skin feel warm to the touch. The blood vessels will narrow again when the body temperature is back to normal.
Detailed explanation-2: -Vasodilation and increased skin blood flow (in concert with sweating) are essential to heat dissipation during heat exposure and exercise. During cold exposure, vasoconstriction in the skin decreases heat loss from the body and protects against hypothermia.
Detailed explanation-3: -Hyperpolarization of the smooth muscle membrane and reduced calcium permeability relax vascular smooth muscle and allow an increase in skin blood flow.