PHYS 1010 Lecture Notes - Lecture 3: Peripheral Nervous System, Myelin, Resting Potential
22 Feb 2019
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Document Summary
Nerves: differentiate between the central and peripheral nervous systems. Resting potential is the electrical potential across a membrane when there is no nerve impulse occurring. The concentration of na is higher outside the axon, while the concentration of. There is usually a higher concentration of cl ions inside the axon, creating a charge difference or resting potential. When an impulse travels down a neuron, sodium moves inside the axon (from a positively charged env"t to a negatively charged env"t). The influx of na ions causes the potential across the membrane to reverse depolarization. Due to this, the k ions move outside the axon to re-stabilize the potential difference repolarization. (restoring the original polarity) Now the sodium and potassium ions are in the wrong place. Cl ions create the initial charge differential that carries the impulse. A synapse is a space between two neurons. The nerve impulse must jump across the synapse.
