Nuerons and Synapses Notes

Nuerons and Synapses Notes - all interneurons function as...

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all interneurons – function as both pre and post synaptic neurons Typical neuron has 100-10,000 axon terminals making synapses and are stimulated by an equal number of other neurons PRESYNAPTIC NEURON (axon terminal and synaptic knobs) *neuron that transmits electrical impulses toward a synapse 1. Nerve impulse reaches end of axon, (voltage gated Ca++ channels open) 2. Ca++ flows in from extracellular space 3. Presence of Ca++ inside axon terminal causes some of the synaptic vessels to fuse with axon membrane 4. Neurotransmitter is released by exocytosis 5. Ca++ removed (taken up into mitochondria or ejected by Ca++ pumps) 6. Neurotransmitter diffuses across synaptic cleft and attaches to ligand gated receptors) Neuroreceptor then: Is quickly absorbed by enzymes Diffused away from receptor into ECF to be absorbed by astrocytes Brought back into presynaptic terminal where it is either stored in new terminal or destroyed Destruction (removal of neurotransmitter) from receptor is important so new impulses can be received from presynaptic neuron POSTSYNAPTIC NEURON (Dendrites) *neuron that transmits electrical activity away from synapse
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Nuerons and Synapses Notes - all interneurons function as...

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