SSC CGL
MediumQ. No. which-substance-is-responsible-for-the-transmission-of-nerve-impulses-at-synapses
Which substance is responsible for the transmission of nerve impulses at synapses?
Last Updated:
AHaemoglobin
BInsulin
CNeurotransmitter
DEnzyme
✅ Correct Answer: C — Neurotransmitter
Neurotransmitters are chemical messengers (e.g., Acetylcholine, Dopamine, Serotonin, GABA) released from the axon terminal of one neuron into the synaptic cleft. They bind to receptors on the next neuron and transmit the nerve impulse forward.
❌ Why other options are wrong:
• A. Haemoglobin — It is a protein in RBCs that carries oxygen, not involved in nerve signal transmission.
• B. Insulin — A hormone secreted by the pancreas to regulate blood glucose levels; has no role at synapses.
• D. Enzyme — Enzymes catalyze biochemical reactions but do not transmit nerve impulses between neurons.
📝 Important Note: Synapse is the junction between two neurons. Neurotransmitters are the only molecules responsible for chemical transmission across synapses. This is a very frequently asked concept in SSC CGL Science section.
Copyright 2026 Exambodh - All rights reserved.