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

1. Secretion of tears after falling of sand particles into the eye.
2. Salivation of mouth at the sight of delicious food
3. Secretion of sweat glands and constriction of skin blood vessels when it is too hot
4. Constriction of skin blood vessels and contraction of skeletal muscles when it is too cold

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

Solution

Negative feedback works by reducing or reversing the initial stimulus to bring the body back toward its set point. When it is too cold, constricting skin blood vessels and contracting skeletal muscles both help conserve and generate heat, so this is a negative feedback response.

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