NEET Biology question

A person entering an empty room suddenly finds a snake right in front of him on opening the door. Which one of the following is likely to happen in his neuro-hormonal control system? [AIPMT 2012]

(A)Sympathetic nervous system is activated, releasing epinephrine and norepinephrine from the adrenal medullaCorrect
(B)Neurotransmitters diffuse rapidly across the cleft and transmit a nerve impulse
(C)Hypothalamus activates the parasympathetic division of the brain
(D)Sympathetic nervous system is activated, releasing epinephrine and norepinephrine from the adrenal cortex

Answer: (A)

Solution

Option (b) merely restates ordinary synaptic transmission and does not address the specific fright response; (c) is wrong because fright triggers the sympathetic, not parasympathetic, division; and (d) wrongly attributes catecholamine release to the adrenal

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Question ID VK-129027