PATHOLOGY MCQ
ENDOCRINE SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Jerry was out for a walk when he was approached by a thief who demanded his wallet. Immediately his pupils dilated, he began to perspire, and his heart accelerated. These changes were activated by his
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sympathetic nervous system
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parasympathetic nervous system
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somatic nervous system
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peripheral nervous system
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Explanation:
Detailed explanation-1: -Pupil dilation is mediated by a sympathetic output acting in opposition to parasympathetically mediated pupil constriction. While light stimulates the parasympathetic output, giving rise to the light reflex, it can both inhibit and stimulate the sympathetic output.
Detailed explanation-2: -The basic autonomic mechanism controlling the pupil is straightforward: pupil constriction is mediated via parasympathetic activation of the circular sphincter pupillae muscle, and dilation via sympathetic activation of the radial dilator pupillae muscle (1).
There is 1 question to complete.