Answer:
During the action potential, the point at which sodium current exceeds potassium current is at the peak or highest point of the action potential.
The action potential is a rapid change in the membrane potential of a neuron or muscle cell. It consists of different phases: depolarization, repolarization, and hyperpolarization. During the depolarization phase, sodium channels open, allowing an influx of sodium ions into the cell. This causes the membrane potential to rise rapidly, and the inside of the cell becomes more positively charged. As the membrane potential reaches its peak, the sodium current is at its maximum, and this is the point where it exceeds the potassium current.
After reaching the peak, the repolarization phase begins, during which the potassium channels open, allowing an efflux of potassium ions out of the cell, leading to the restoration of the cell's negative resting membrane potential. As the membrane potential returns to its resting state, the sodium and potassium currents balance out again.
Step-by-step explanation: