When the resting potential across the membrane of a neuron is temporarily lost, Depolarisation, A brief reversal of the resting potential across the cell surface membrane, Action potential, Usually -50mV. If this is reached more sodium ion channels open, causing an action potential, Threshold potential, The short time after firing during which it is more difficult to stimulate a neuron, Refractory period, When the resting potential is lower than usual. Occurs after an action potential, Hyperpolarised, A fatty layer around a neuron that consists of many layers of plasma membranes of Schwann cells, Myelin sheath, The potential difference or voltage across the neurone cell membrane while the neuron is not being stimulated, Resting potential, These allow ions to pass through a membrane according to changes in potential difference, Voltage-gated channel, When the potential difference returns to negative inside the cell compared with outside, Repolarisation, A small depolarization of the membrane in a receptor cell, Generator potential, A protein carrier that requires energy from ATP to move Na+ and K+ ions in opposite directions simultaneously, Sodium/potassium pump, A long, thin strand of a neuron that carries an impulse away from the cell body, Axon.

neuron key words

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