Which one of the following is the effect of a sympathetic nervous system?
Correct answer: D. Dilates the pupil
- A. Constriction of bronchi
- B. Decrease in heart rate
- C. Promotes digestion or peristalsis
- D. Dilates the pupil
Explanation
The sympathetic nervous system activates during flight or fight conditions. It can accelerate heart rate, widen bronchial passage, decrease the motility of the large intestine, constrict blood vessels, increase peristalsis in the esophagus cause pupillary dilation. The sympathetic nervous system is also responsible for goosebumps, sweating, and a rise in blood pressure.
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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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