AIPMT PRELIMS 2007 Zoology Homeostasis MCQ Question
Which of the following is an example of negative feedback loop in humans?
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
constriction of skin blood vessels and contraction of skeletal muscles when it is too cold
Correct Answer
Detailed Explanation
Constriction of blood vessels and muscle contraction in response to cold is a negative feedback mechanism to maintain body temperature.
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