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Given below is a table comparing the effects of sympathetic and parasympathetic nervous system for four features (1-4).

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Given below is a table comparing the effects of sympathetic and parasympathetic nervous system for four features (1-4).

Which one feature is correctly described?

  Feature  -   Sympathetic nervous system - Parasympahtetic nervous system

(a) Salivary glands - Stimulates secretion - Inhibits secretion

(b) Pupil of the eye - Dilate - Constricts

(c) Heart rate - Decrease - Increase

(d) Intestinal peristalsis - Stimulates - Inhibits

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Correct answer: (b)

Explanation:

Sympathetic nervous system inhibits salivary gland secretion, accelerate heart rate, decreases intestinal peristalsis and dilate pupil of the eye. Whereas parasympathetic nervous system stimulates salivary gland secretion, slows heart rate, stimulates intestinal peristalsis and constricts pupil of the eye. The sympathetic and the parasympathetic nervous system are parts of what is commonly called the autonomic nervous system. These systems work in balance with each other and directly or indirectly affect almost every structure in the body (e.g. heart frequency, heart capacity, lumbar function, kidneys, blood vessels, stomach and intestines). The sympathetic nervous system has an active “pushing” function, the parasympathetic has mainly a relaxing function.

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