Synapse nerve junctions, SEM

Synapse nerve junctions, SEM

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Caption: Synapse nerve junctions. Coloured scanning electron micrograph (SEM) of a section through nerve cells showing their synapses, the junctions between two nerve cells. At a synapse an electrical signal is transmitted from one cell to the next in only one direction. When an electrical signal reaches a synapse it triggers the release of neurotransmitter chemicals from vesicles (green) in the presynaptic cell. The neurotransmitters cross a microscopic gap called the synaptic cleft and bind to receptors on the postsynaptic cell, causing it to propagate an electrical impulse. Mitochondria, which supply the cells with energy, are red.

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Keywords: anatomical, anatomy, axon, biological, biology, cells, central nervous system, cns, coloured, cross-section, dendrite, dendrites, energy, false-coloured, healthy, junction, junctions, message, mitochondria, mitochondrion, nerve cell, neural, neurological, neurology, neuron, neurone, neurones, neurons, neurotransmitter, normal, organelle, post-synaptic, postsynaptic, pre-synaptic, presynaptic, relay, relaying, scanning electron micrograph, scanning electron microscope, section, sectioned, sem, signal, signals, synapse, synaptic, system, transmitting, vesicle, vesicles

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