IB Biology HL C2.2.3 Nerve Impulses As Action Potentials Questions

Follow how a stimulus triggers sodium influx and depolarization, then how an action potential propagates along a nerve fibre.

Exam points

Explain how stimulus-triggered sodium influx depolarizes and reverses membrane polarity, followed by potassium efflux and repolarization.
Describe how threshold depolarization initiates an action potential that propagates to adjacent membrane along a nerve fibre.

[Maximum number: 1]

Neurons transmit electrical impulses. Which statement describes part of this process?

$\mathrm{K}^{+}$ ions are pumped out of the cell to depolarize the membrane.

Ion channels let $\mathrm{K}^{+}$ diffuse into the cell to depolarize the membrane.

$\mathrm{Na}^{+}$ ions are pumped into the cell to repolarize the membrane.

Ion channels let $\mathrm{Na}^{+}$ diffuse into the cell to depolarize the membrane.

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