BIO 203 Lecture Notes - Lecture 6: Major Depressive Disorder, Neuromuscular Junction, Libido

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7 Mar 2019
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Once started, action potential does not diminish. Does not vary in intensity with the strength of the stimulus that triggered it. For a brief period following an action potential, the neuron cannot be stimulated again. It occurs because the sodium channels are closed and cannot be reopened. Communication between a neuron and an adjacent cell occurs by neurotransmitters. Synapse is a junction between a neuron and another cell. In the case of two neurons, the presynaptic neuron sends a message to the postsynaptic neuron. Swelling at the end of the axon of the presynaptic neuron. The nerve impulse reaches the synaptic knob of the presynaptic neuron. Calcium ions move into the synaptic knob which releases the neurotransmitter into the synaptic cleft. The neurotransmitter diffuses across the synaptic cleft and binds with receptors on the membrane of the postsynaptic neuron, causing an ion channel to open.

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