NEET Biology question

Biology Neural Control and Coordination NEET

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

(A)Salivary gland: Sympathetic-Stimulates secretion, Parasympathetic-Inhibits secretion
(B)Pupil of the eye: Sympathetic-Dilates, Parasympathetic-ConstrictsCorrect
(C)Heart rate: Sympathetic-Decreases, Parasympathetic-Increases
(D)Intestinal peristalsis: Sympathetic-Stimulates, Parasympathetic-Inhibits

Answer: (B)

Solution

Sympathetic stimulation genuinely dilates the pupil (via the radial/dilator muscle) while parasympathetic stimulation constricts it (via the sphincter muscle), which is correctly described in row (b); by contrast, sympathetic activity actually reduces (not stimulates) salivary secretion while parasympathetic activity

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Question ID VK-117533