medium · MCAT bio-biochem
An experimental drug blocks the inactivation gate of voltage-gated Na⁺ channels in neurons.
If a stimulus reaches the threshold, how would the shape of the resulting action potential be altered?
- The threshold potential would shift toward a more positive membrane value.
- The repolarization phase would be significantly delayed or absent.
- The hyperpolarization phase would occur more rapidly than it normally does.
- The depolarization phase would simply fail to occur at all.
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