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Question 24

From Biology HL Paper 1 (May 2024, TZ2)

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  1. Doctors often use drugs to restore normal action potentials. The oscilloscope trace shows the effect of one of these drugs, which acts on potassium (K) ion channels of cell membranes.
A line graph illustrating the change in membrane potential (mV) over time, comparing a 'with drug' condition (dotted line) and a 'without drug' condition (solid line). The graph shows an action potential, with the 'with drug' trace having a prolonged repolarization phase.
A line graph illustrating the change in membrane potential (mV) over time, comparing a 'with drug' condition (dotted line) and a 'without drug' condition (solid line). The graph shows an action potential, with the 'with drug' trace having a prolonged repolarization phase.

From the graph, what can be concluded about the effect of this drug on membrane potentials?

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