Q. A person entering an empty room suddenly finds a snake right in front on opening the door. Which one of the following is likely to happen in his neuro-hormonal control system ?
A) Sympathetic nervous system is activated releasing epinephrine and norepinephrine from adrenal cortex
B) Sympathetic nervous system is activated releasing epinephrine and norepinephrine from adrenal medulla
C) Neurotransmitters diffuse rapidly across the cleft and transmit a nerve impulse
D) Hypothalamus activates the parasympathetic division of brain
Explanation
[Solution from source] In a fright response the sympathetic nervous system stimulates the adrenal medulla to release epinephrine and norepinephrine (fight-or-flight). These hormones come from the medulla, not the adrenal cortex, and the parasympathetic division is not activated in an emergency. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.