Question 2

With regard to the action potential:

Select true or false for each option, then select Submit.

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A. True. This explains why the membrane potential is positive at the peak of the action potential.

B. False. Each action potential has the same magnitude and duration irrespective of the strength of the stimulus. This is known as the 'all or none law'.

C. False. A firing level is reached after about 15 mV of depolarization. Smaller stimuli than this simply decay and are not propagated.

D. True. Remember the cardiac muscle action potential is much longer (200 ms) because of slow Ca²⁺ channels.

E. True. This enables the neurone to reset the conditions for another action potential to be propagated.

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