movement of potassium ions out of the cell causes the membrane to

Expert Solution

Action potential:

Action potential is a rapid rise and subsequent fall of membrane potential across a cellular membrane with a specific pattern.

Examples of cells which signal action potential: neuron cells and muscle cells.

Sufficient current is required to initiate a voltage response in a cell membrane; if the current is insufficient to depolarize the membrane, an action potential will not fire.

Stimulus: A stimulus starts the rapid change in action potential or voltage. Sufficient current should be given to the cell in order to raise the voltage above the threshold voltage to start membrane depolarization.
Depolarization: it is caused by a rapid rise in membrane potential and opening of sodium channels in the cellular membrane causing large influx of sodium ions
Membrane repolarization: It results from rapid sodium channel inactivation and large efflux of potassium ions resulting from activated potassium channels.
Hyperpolarisation: lowered membrane potential causing efflux of potassium ions and closure of the potassium channels
Resting state: it is when membrane potential returns to the resting voltage that occurred before the stimulus occurred.

Answer: Hence movement of potassium ions out of the cell causes the membrane to repolarization.

Nightingale answered 2 years ago

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