from where do we get calcium ion to release neurotransmitter

1.	from where do we get calcium ion to release neurotransmitter
Answer» The shape of the\xa0calcium\xa0channel\xa0protein\xa0allows only\xa0calcium ions\xa0to pass through the channel. ... There the\xa0calcium ions\xa0interact with the\xa0neurotransmitter\xa0containing vesicles (membrane-bound containers) causing them to fuse with the cell membrane, and\xa0release\xa0the\xa0neurotransmitters\xa0into the synaptic cleft.\xa0Calcium\xa0(Ca2+) is a vital element in the process of neurotransmitter release; when\xa0Ca2+\xa0channels are blocked, neurotransmitter release is inhibited.\xa0Storage of the\xa0neurotransmitter\xa0in storage granules or vesicles in the axon terminal. Calcium enters the axon terminal during an action potential, causing\xa0release\xa0of the\xa0neurotransmitter\xa0into the synaptic cleft. After its\xa0release, the transmitter binds to and activates a receptor in the postsynaptic membrane.

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