A) gamma aminobutyric acid
B) acetylcholine
C) thyroxine
D) melatonin.
Correct Answer: B
Solution :
: Acetylcholine is responsible for the transmission of the nerve impulse across the synapse between contiguous nerve cells or across the neuromuscular junction. Acetylcholine molecules combine with special receptors in the surface membrane of the postsynaptic cell, initiating a new action potential. The molecules are rapidly degraded by the action of cholinesterase ensuring that the impulse is transient. Acetylcholine is the acetyl ester of the organic base choline and on breakdown yields acetate and choline. GABA is inhibitory neurotransmitter. Thyroxine and melatonin are the hormones secreted by thyroid gland and pineal gland respectively.
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