Which of the following statement concerming synthesis and storage of the autonom

Question

Which of the following statement concerming synthesis and storage of the autonomic nervous system neurotransmitters is TRUE Answers A D ABoth Acetylcholine and Norepinephrine are stored in synaptic vesicles in the presynaptic nerve terminal. B Epinephrine is converted to Norepinephrine by the enzyme phenylethanolamine-N-methyltransferase (PMNT) C , The rate-limiting step in the synthesis of Acetylcholine is the activity of Choline acetyltransferase. D The release of both Acetylcholine and Norepinephrine is dependent on the influx of extracellular sodium ions (Nat) into the nerve terminal.

Explanation / Answer

ANSWER IS:

A Both Acetylcholine and Norepinephrine are stored in synaptic vesicles in the presynaptic nerve terminal.

EXPLANATION:

Two main neurotransmitters that regulate autonomic nervous system are : acetylcholine and norepinephrine.

All motor nerves release acetylcholine that activate nicotinic acetylcholine receptors.

All postganglionic parasympathetic nerves release acetylcholine that activate muscarinic receptors.

Both noradrenaline ( or norepinephrine) and acetylcholine are stored in synaptic vesicles in the presynaptic nerve terminals.

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