Question

Constriction of the pupil is function of

• A. Parasympathetic system
• B. Hypothalamus
• C. Thalamus
• D. None of the above

Answer 1

Answer: (A)

Parasympathetic system

Constriction of the pupil is the function of the parasympathetic system. The parasympathetic nervous system is one of the two divisions of the autonomic nervous system, the other is the sympathetic nervous system. The autonomic nervous system is responsible for regulating the body's unconscious actions. The parasympathetic system is responsible for stimulation of "rest and digest" or "feed and breed" activities that occur when the body is at rest, especially after eating, including sexual arousal, salivation, lacrimation (tears), urination, digestion and defecation.