Discussion
Immediate response on exposure to cold environment involves
Answer: D
The immediate response to exposure to a cold environment is vasoconstriction, the narrowing of the blood vessels of the skin and extremities. It reduces blood flow to the surface and so cuts heat loss from the body core within seconds of the exposure.
Thermogenesis (shivering and non-shivering heat production) is a later, supplementary response. Vasodilation is the heat-dumping response to warm conditions. Homeostasis is the general name for keeping the internal state steady, not a specific response to cold.
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