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Synaptic transmission is a fundamental process in the nervous system, allowing communication between neurons. It refers to the process through which signals are transmitted across synapses, the junctions between two neurons or between a neuron and a target cell, such as a muscle or gland cell. This process is essential for the functioning of the entire nervous system, including perception, cognition, and behavior. Neurons communicate with each other by transmitting electrical impulses along their axons. These impulses are called action potentials, and they travel down the axon until they reach the axon terminals, which are in close proximity to the target cell. The area between the axon terminal of one neuron and the dendrite or soma of the next neuron is called the synapse. The synapse is not a direct electrical connection; instead, it involves the release of chemical messengers called neurotransmitters, which facilitate the transmission of the signal across the synaptic gap. The process of synaptic transmission begins when an action potential reaches the axon terminal of the presynaptic neuron. The arrival of the action potential causes voltage-gated calcium (Ca²⁺) channels to open, allowing calcium ions to flow into the terminal. The influx of calcium triggers the movement of synaptic vesicles containing neurotransmitters toward the presynaptic membrane. These vesicles fuse with the membrane, releasing the neurotransmitters into the synaptic cleft, the small space between the two neurons. The neurotransmitters then bind to receptors on the postsynaptic neuron or ____ ____ __________ ____ ____ ____ ___ ______.
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