ANIMAL PHYSIOLOGY
OSMOREGULATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Release of thyroxine decreases the rate of metabolism.
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Blood vessels close to the surface of the skin constrict.
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Increased secretion of epinephrine restricts the amount of sugar released into the circulatory system.
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Blood vessels in deep muscles constrict so that heat is conserved.
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Detailed explanation-1: -Blood vessels, which lead to the skin capillaries, become narrower-they constrict – which allows less blood to flow through the skin and conserve the core body temperature. This is called vasoconstriction .
Detailed explanation-2: -Evaporative mechanisms Evaporation removes heat and can act as a cooling mechanism. For instance, many mammals can activate mechanisms like sweating and panting to increase evaporative cooling in response to high body temperature.
Detailed explanation-3: -In an effort to defend body temperature, our bodies decrease blood flow to the skin to reduce heat loss. We also increase internal heat production through several mechanisms. One example is shivering-or the rapid contraction of muscles-which can quickly produce large quantities of heat within the body.
Detailed explanation-4: -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-5: -When temperatures drop, cold-blooded animals become less active, even sluggish. Because small bodies must produce so much heat to stay warm, the size of warm-blooded animals is limited.