The duration of a compound action potential is defined as [2 marks] A the time b

Question

The duration of a compound action potential is defined as [2 marks]

A the time between the fastest individual action potential passing under the first recording electrode and the fastest travelling action potential passing under the second recording electrode

B the time between applying the stimulus and the fastest travelling individual action potential passing under the first recording electrode

C the time between the fastest individual action potential passing under the first recording electrode and the slowest travelling action potential passing under the second recording electrode

D the time between applying the stimulus and the fastest travelling individual action potential passing under the second recording electrode

E the number of individual action potentials passing under the first recording electrode

Explanation / Answer

Compound action potential is divided into two time periods. It is the time between fastest individual action potential travelling through first recording electrode and the slowest action potential travelling through second electrode. This is because the first action potential is triggered with great stimulus and is rapid. Immediately a second action potential is not generated after the first. Thus, second action potential depends on strength required to pull it through electrode. Thus, it is slow and this time gap between first and second is a compound action potential. Option C is correct.

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