One function of the parasympathetic nervous system is:
Correct answer: D. Constriction of pupil
- A. Contraction of hair muscles
- B. Stimulation of sweat glands
- C. Acceleration of heart beat
- D. Constriction of pupil
Explanation
The action of the parasympathetic nervous system is opposite to that of the sympathetic nervous system. If the sympathetic nervous system accelerates an action, the parasympathetic nervous system slows it. However, neither system is exclusively excitatory or inhibitory. The parasympathetic fibres constrict the pupil, decrease the rate and force of heartbeat, dilate many blood vessels, lower the arterial blood pressure, quicken the peristaltic movements, and contract the urinary bladder.
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About Coordination and Control
Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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