Synapses

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Jessica

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Compléter SynapsesVersion en ligne Fill in the blanks par Jessica 1 The presynaptic neuron is the neuron that sends information across a synapse . Its axon terminal contains synaptic vesicles filled with , and to supply ATP for vesicle and neurotransmitter synthesis . - gated channels in the presynaptic membrane allow influx when an potential arrives , triggering vesicle fusion with the . Vesicles are after release . 2 The presynaptic neuron stores and releases into the cleft in response to potentials . Neurotransmitter release allows communication with the postsynaptic neuron , where it binds - gated to generate potentials in the neuron . This is why the synapse is called chemical , because information is transmitted via a messenger rather than direct current . 3 The presynaptic neuron modulates signal strength in a stepwise manner . More potentials open voltage - gated calcium channels , allowing more to enter . This triggers more to release into the synaptic cleft , so more neurotransmitter binds to postsynaptic , producing a larger postsynaptic and a effect . 4 Chemical synapses also ensure transmission , because neurotransmitter is only released from the terminal , and only the membrane contains the appropriate receptors . This prevents signaling , ensuring reliable information flow from presynaptic to postsynaptic neurons .