INTEGUMENTERY SYSTEM
DERMIS
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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: -Temperature. A person’s body contains nerve cells called thermoreceptors, which detect temperature changes in the environment. When the environment becomes too warm, the thermoreceptors trigger vasodilation. This directs blood flow toward the skin, where excess body heat can escape.
Detailed explanation-2: -Too hot. When we get too hot, sweat glands in the skin release more sweat. The sweat evaporates, transferring heat energy from the skin to the environment. Blood vessels leading to the skin capillaries become wider-they dilate-allowing more blood to flow through the skin and more heat to be lost to the environment.
Detailed explanation-3: -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-4: -Vasodilation: leads to greater blood flow to the area of inflammation, resulting in redness and heat. Vascular permeability: endothelial cells become “leaky” from either direct endothelial cell injury or via chemical mediators.