Which of the following is an example of negative feedback loop in humans?

constriction of skin blood vessels and contraction of skeletal muscles when it is too cold

secretion of tears after falling of sand particles into the eye

salivation of mouth at the sight of delicious food

secretion of sweat glands and constriction of skin blood vessels when it is too hot

Solution

constriction of skin blood vessels and contraction of skeletal muscles when it is too cold

Skin blood vessels constrict and skeletal muscles contract due to cold is an example of negative feedback mechanism of homeostatis.

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