NEET Sample Paper NEET Sample Test Paper-15

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

    A)  Secretion of tears after falling of sand particles into the eye.

    B)  Salivation of mouth at the sight of delicious food.

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

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

    Correct Answer: D

    Solution :

    When the set point of hypothalamus is disturbed by high temperature, it stimulates vasodilation and sweating occurs while in low temperature there is vasoconstriction and shivering. Hence, the correct option is [d].

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