what happens to acetylcholine (ach) after it is released from the presynaptic membrane? answer unselected ach is reabsorbed. unselected ach is recycled directly back into the nerve. unselected ach diffuses away from the synapse. unselected ach is broken down and the choline is reabsorbed.

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Acetylcholine combines with a receptor molecule in the postsynaptic membrane of a muscle fibre results in muscle cell contraction. The unselected ach is broken down and the choline is reabsorbed.

What is acetylcholine (ach)?

Acetylcholine, an organic chemical which functions in the brain and body of many animals as a neurotransmitter. It's name is derived from its chemical structure: this is an ester of acetic acid and choline. Parts in the body that are affected by acetylcholine are referred to as cholinergic.

At presynaptic terminal, acetylcholine storage occurs in the presynaptic vesicle. With the stimulation of the presynaptic terminal, acetylcholine is released from the vesicles into the synaptic cleft, where the neurotransmitter is free to bind with receptors.

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