9. A ction potentials move along the axon in small segments, when one segmentis

Question

9. A ction potentials move along the axon in small segments, when one segmentis repolarizing the next segment is depolarizing, what is the purpose of this? To move the electrical charge safely along the axon so it doesn't get damaged To allow the neuron to adjust the strength of the action potential as it moves To keep the action potential from move the wrong direction along the axon Action potentials do not move in segments and the whole axon is depolarized and repolarized at the same time. a. b. d.

Explanation / Answer

Answer C

The propogation of the action potential or nerve impulse along the nerve fibre is called transmission.

This is achieved along the axon by a wave of depolarisation .

In a resting neuron there is a difference between the ionic concentration outside and inside of the plasma membrane. When ion channels open and cause a difference in charges depolarisation takes place. depolarisation at one point triggers the opening of the ion channels at the next segment and the previous segment gets repolarized , this helps in the transmission of action potential as a unidirectional wave.

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