[Constriction of skin bloo...] Which one of the following is an example of negative feedback loop in humans?

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

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

Secretion of tears after falling of sand particles into the eyes

Salivation of mouth at the sight of delicious food

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

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Given below is a table comparing the effects of sympathetic and parasympathetic nervous system for four features (a-d). Which one feature is correctly described?

Feature	Sympathetic Nervous System	Parasympathetic Nervous System
(a) Salivary gland	Stimulates secretion	Inhibits secretion
(b) Pupil of the eye	Dilates	Constricts
(c) Heart rate	Decreases	Increases
(d) Intestinal peristalsis	Stimulates	Inhibits

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Which one of the following pairs of structures distinguishes a nerve cell from other types of cell?

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

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