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

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

Solution & Step-by-step Explanation

Negative feedback acts to reverse a change. When the body temperature drops (cold), the body responds by constricting blood vessels (to reduce heat loss) and shivering (skeletal muscle contraction to generate heat), attempting to bring the temperature back to the set point.

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Which one of the following is an example of negative feedback loop in humans?
A
Constriction of skin blood vessels and contraction of skeletal muscles when it is too cold
B
Secretion of mouth after falling of sand particles into the eye
C
Salivation of mouth at the sight of delicious food
D
secretion of sweat glands and constriction of skin blood vessels when it is too hot

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