A chemical secreted by one cell interacts with target cells nearby in paracrine signalling. The way neurotransmitters move signals between nerve cells at a synapse serves as an illustration.
The terminal produces and stores small molecule neurotransmitters for quick release. Because they must be carried from the cell body to the terminal after being generated there, neuropeptides may release more slowly.
Small "packages" called vesicles are used to hold neurotransmitter molecules (see the picture on the right). When the vesicles containing neurotransmitters "fuse" with the membrane of the axon terminal, the neurotransmitter is released from the axon terminal and spills into the synaptic cleft
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