easy · MCAT bio-biochem
During the 'upstroke' of an action potential, which of the following best describes the movement of ions and the state of the membrane?
- K^+ efflux through leak channels, leading to hyperpolarization.
- Active transport of 3 Na^+ out and 2 K^+ in via the Na^+/K^+ ATPase.
- Cl^- influx, which opposes the threshold stimulus.
- Na^+ influx through voltage-gated channels, leading to depolarization.
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