Question

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 neurohormonal control system?

• A. Hypothalamus activates the parasympathetic division of brain
• B. Sympathetic nervous system is activated releasing epinephrine and norepinephrine from adrenal cortex
• C. Sympathetic nervous system is activated releasing epinephrine and norepinephrine from adrenal medulla
• D. GABA neurotransmitters diffuse rapidly across the cleft and transmit a nerve impulse

Answer 1

Answer: (C)

The fight-or-flight response, also known as the acute stress response, refers to a physiological reaction that occurs in the presence of something that is terrifying, either mentally or physically. In response to acute stress, the body's sympathetic nervous system is activated due to the sudden release of hormones. The sympathetic nervous systems stimulate the adrenal glands triggering the release of catecholamines, which include adrenaline and noradrenaline. This results in an increase in heart rate, blood pressure and breathing rate. So, the correct answer is option C.