IB Biology HL 2.2.3 Nerve impulses as action potentials Question Bank

Practise IB Biology HL 2.2.3 by analysing action-potential location, initiation and membrane-potential data.

Exam points

Analyse how depolarisation and ion-channel changes initiate an action potential.
Interpret membrane-potential graphs to distinguish threshold, all-or-none response and propagation.

[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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