JEE Main 2023 · 31 January · evening · Single correct · +4 / −1
The element playing significant role in neuromuscular function and interneuronal transmission is :
- (a) Be
- (b) Ca
- (c) Mg
- (d) Li
Answer and solution
Answer (b) Ca
Solution
Chemistry ma’am · 2 steps
Nerves firing and muscles contracting both run on calcium ions, so this one is Ca.
- Calcium's job. When a nerve signal reaches the end of a neuron, Ca²⁺ ions rush in and trigger the release of neurotransmitters. That is interneuronal transmission. In muscle, Ca²⁺ release starts contraction, which is neuromuscular function.
Element Main biological role Be no useful role; its compounds are toxic Ca neuromuscular function, nerve transmission, bones and teeth, blood clotting, cell membrane integrity Mg activates enzymes that use ATP; central atom of chlorophyll Li no natural role in the body; its salts are used as a medicine for mood disorders - So. The element behind neuromuscular function and interneuronal transmission is calcium, option (b).
The idea to keep. Learn the NCERT pairs: Ca²⁺ for nerves, muscles, bones and blood clotting; Mg²⁺ for ATP enzymes and chlorophyll; Na⁺ and K⁺ for nerve impulses and the sodium-potassium pump.
Answer from the NTA final answer key. Solution by PrepWiser.