Question

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

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

• A. a
• B. b
• C. c
• D. d

Answer 1

The correct option is B b

A normal pupillary constriction is a balance between the sympathetic and parasympathetic nervous systems. Parasympathetic innervation leads to the constriction of the pupil of the eye. Sympathetic stimulation of the adrenergic receptors causes the contraction of the radial muscle and subsequent dilation of the pupil. Thus, the correct answer is option B.