NROB60H3 Chapter 5: NROB60 CH. 5

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17 Dec 2011
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Synaptic transmission process of info transfer at the synapse. Electrical synapse electrical current flowing from one neuron to the next. Chemical synapse chemical nt transfer info from one neuron to another at the synapse. Info flows in one direction from a neuron to its target cell. First neuron presynaptic, target cell post synaptic. Direct transfer of ionic current from one cell the next. Membranes of two cells are separated and narrow gap is spanned by clusters of protens called connexins. Six connexins = connexon, 2 connexons = gap junction channel. Channel allows ions to pass directly from cytoplasm of one cell to the other. Big enough o allow major cell ions and many small organic molecules to pass through. Cells connected by gap junctions electrically coupled. When two neurons are electrically coupled an ap in the presynaptic neurons causes a small amount of ionic current to flow across the gap junction channels into the other neuron.

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