EMBRYOLOGY
RESPIRATORY SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Dilate to make the blood vessels smaller so blood can flow faster
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Constrict to make the blood vessels smaller so blood can stay close to core
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Either A or B
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None of the above
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Detailed explanation-1: -Normally, the vessels that supply blood to the skin constrict or narrow in response to cold temperatures. This reaction, called “vasoconstriction, ‘’ decreases blood flow to the skin, which helps to minimize heat loss from the warm blood and therefore preserve a normal internal or “core” temperature.
Detailed explanation-2: -If our body needs to warm up, the mechanisms of thermoregulation include: Vasoconstriction: As the blood vessels under the skin receive signals they become narrower to decrease the blood flow and retain heat to warm the inner body.
Detailed explanation-3: -The skin’s immense blood supply helps regulate temperature: dilated vessels allow for heat loss, while constricted vessels retain heat. The skin regulates body temperature with its blood supply.
Detailed explanation-4: -Blood vessels supplying blood to the skin can swell or dilate-vasodilation. This causes more heat to be carried by the blood to the skin, where it can be lost to the air. Blood vessels can shrink down again-vasoconstriction. This reduces heat loss through the skin once the body’s temperature has returned to normal.