Dilation of the pupil of human eye is caused by : a) parathormone b) sympathetic nerve c) parasympathetic nerve d) autonomic nervous system
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sympathetic nerve
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When the sphincter pupillae contract, the iris decreases or constricts the size of the pupil. The dilator pupillae, innervated by sympathetic nerves from the superior cervical ganglion, cause the pupil to dilate when they contract. These muscles are sometimes referred to as intrinsic eye muscles.
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