Question

Which is NOT true of an action potential? a. The generation involves opening and closing of...

Which is NOT true of an action potential?

a.

The generation involves opening and closing of Na+ and K+ membrane channels.
b.

The depolariztion diminishes as the action potential moves along the axon
c.

It is an all or nothing event
d.

The action potential typically depolarizes from -70mV to +30mV before repolarizing.
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Answer #1

Option b is not true regarding action potential.

Depolarization doesn't diminish as action potential moves along axon to conduct a nerve impulse.

Generation of action potential involves opening and closing of voltage gated Na+ channels mostly but there will be some amount of K+ channel opening and closing also but the electrochemical gradient is fabourable for Na+ entry than K+ exit.

Action potential follows all or none phenomenon i.e., it occurs with a constant amplitude and shape irrespective of magnitude os stimulus.

The action potential typically depolarizes from -70mV to +30mV before repolarising and it is due to opening of voltage gated Na+ channels causing massive influx of sodium ions.

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