nervous system notes - 18/01/2007 12:28:00 Neurons carry...

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18/01/2007 12:28:00 Neurons carry information one way only Axon carries away ___ carries to myelin layer is like insulator for axons humans only have bipolar and multipolar neurons dendrites are long connectors a nerve is a bundle of thousands of axons communication within individual neurons internal membrane is charged; outside is +; inside is – ‘wave of positive charge’ (action potential) lots of sodium outside the cell. Depolarization: gate opens, sodium rushes in Neurons never send partial signals (light pain means fewer neurons fired) communication between 2 neurons Synapse: open space between 2 neurons Tendons connect muscles to bones. Nerves are under the tendons. Venule is a little vein Myelin Sheath Jelly-rolled Schwann cells of the myelin sheath Myelin layers are different thicknesses
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o Thicker layer = faster response o Practicing a task grows a thicker layer Reflex Arcs – only go to the spinal cord, not the brain Reflex – automatic movement in response to stimulus
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nervous system notes - 18/01/2007 12:28:00 Neurons carry...

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