In an action potential, the inflow of positively charged ions drives the membrane potential in a positive direction, and if it surpasses a threshold around _____ mV, it increases rapidly until it reaches a peak at about +30 mV.
A) -15
B) -25
C) -35
D) -45

Question

Quizplus · Accepted Answer

The threshold potential for triggering an action potential is typically around -45 to -55 mV. When the membrane potential surpasses this threshold, voltage-gated sodium channels open, leading to a rapid influx of sodium ions and a swift rise in membrane potential towards the peak of the action potential.

In an Action Potential, the Inflow of Positively Charged Ions