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| Description: 1 Action potentials flow along the axon of a motor neuron to a neuromuscular junction, where an axon terminal forms a synapse with a muscle fiber. 2 The axon terminal stores neurotransmitter ( green) inside synaptic vesicles. 3 The arrival of an action potential at an axon terminal causes calcium ions (Ca++) to enter the neuron. 4 The influx of Ca++ causes exocytosis of synaptic vesicles, so neurotransmitter is released into the synaptic cleft. 5 The plasma membrane of the post-synaptic cell has receptors that bind neurotransmitter. 6 Binding of neurotransmitter opens a channel through the receptor, allowing ions to flow into the postsynaptic cell. Picture Stats: Views: 196 Filesize: 220.01kB Height: 1034 Width: 628 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=47714 |