Question

The Sympathetic nervous system $\text{(S.N.S.)}$ work through secretion of :

• A. Noradrenaline which stimulates the organ
• B. Acetyl choline which stimulates the organ
• C. Adrenaline which inhibits the organ
• D. Both A and B

Answer 1

The correct option is D Both A and B

The sympathetic nervous system $\text{(S.N.S.)}$ is light or flight type of response, it works for neuronal and hormones stress response. These fibre secrete acetylcholine which starts the activation and secretion of adrenaline and nor-adrenaline. Acetylcholine stimulates the muscles. Adrenaline and nor-adrenaline stimulate the organs such as heart and kidney.

The body's sympathetic nervous system is triggered in response to acute stress. Increased heart rate, BP and breathing rate triggers the sympathetic nervous system. After 20 to 60 minutes, the body returns to its natural state.

The sympathetic nervous system acts in response to neuronal and hormonal stress. The fight-or-flight type of response or sympathoadrenal type of response is often referred to as this type of response. The preganglionic sympathetic fibres produce this reaction. In the adrenal gland, these fibres stop. These fibres secrete acetylcholine, thus initiating adrenaline and noradrenaline activation and secretion. The muscles are activated by acetylcholine.

Organs such as the heart and kidney are activated by adrenaline and norepinephrine. Thus, the S.N.S work through the secretion of noradrenaline and acetylcholine.
So, the correct answer is option D.