Q.

Regarding the nerve fibre action potential, which statement is INCORRECT?

A. does not involve calcium ions
B. after-depolarisation commences when repolarisation is 70% complete
C. total number of ions involved is minute compared to the total number present
D. spike potential peaks at sodium equilibrium potential
E. firing level (threshold) is at about -55mV
Answer» D. spike potential peaks at sodium equilibrium potential
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