a neuron from the axon terminal of which an electrical impulse is transmitted across a synaptic cleft to the cell body or one or more dendrites of a postsynaptic neuron by the release of a chemical neurotransmitter.
Presynaptic neuron sends postsynaptic receives
Divergent
Being broken down by enzymes and being reabsorbed by the presynaptic neuron.
in the membrane that covers axonsThey are located in the axon hillock, nodes of Ranvier, and presynaptic terminal of the neuron.
The synapse between pre synaptic and post synaptic neuron. Here the acetylcholine is released. It is destroyed by the enzyme acetylcholinesterase in milliseconds, once the impulse is passed to the post synaptic neuron
a neuron
Presynaptic neuron sends postsynaptic receives
Presynaptic membrane
Leaves the presynaptic neuron, activates ion channel
Sodium ions
Terminal Button
endocannabinoids
When the action potential reaches the button(axon terminal) of the presynaptic neuron the depolarization causes voltage gated calcium channels to open increasing intracellular calcium content. This causes synaptic vesicles to fuse to the membrane and release neurotransmitters that bind to the post synaptic neuron and create a chemical action potential.
Divergent
Being broken down by enzymes and being reabsorbed by the presynaptic neuron.
Inhibition of a stimulatory neuron before it synapses, by inhibiting Ca2+ entry and blocking downstream processes, preventing neurotransmitter release, and therefore preventing the neuron generating and EPSP post-synaptically.
They don't, the neurotransmitters stay on either side of the synapse. Neurotransmitters are released when the synaptic vesicles fuse with the presynaptic neuron's membrane, so as to release them into the synaptic cleft.