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About acetylcholine, all the following is true excepta. Its synthesis is catalyzed by the choline acetyltransferase enzymeb. Its muscarinic actions can be blocked by atropine. c. Its nicotinic actions can be large doses of nicotined. It is not secreted by any symp. Postgang. Nerve fibres

Question

About acetylcholine, all the following is true excepta. Its synthesis is catalyzed by the choline acetyltransferase enzymeb. Its muscarinic actions can be blocked by atropine. c. Its nicotinic actions can be large doses of nicotined. It is not secreted by any symp. Postgang. Nerve fibres

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Solution

The statement that is not true about acetylcholine is: "It is not secreted by any sympathetic postganglionic nerve fibres."

While it's true that the primary neurotransmitter secreted by most sympathetic postganglionic nerve fibres is norepinephrine, there are exceptions. For example, the sweat glands receive their sympathetic innervation from postganglionic fibres that secrete acetylcholine, not norepinephrine. Therefore, the statement is not entirely correct.

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