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Which of the following is an example of ...

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

A

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

B

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

C

Secretion of tears after falling of sand particles into the eye

D

Salivation of mouth at the sight of delicious food

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The correct Answer is:
B
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