Homework Answers
An action potential is generated when a threshold stimulus is applied. The resting membrane potential is -70 mv. Here different letters represent different phases of an action potential.
A: Letter A represents depolarization which occurs due to opening of voltage gated Na+ channels. The inward movement of positively charged Na+ ions causes depolarization.
B: Letter B represents repolarization. After reaching a maximum membrane potential due to depolarization (+30 mV) Na+ channels close and opening of K+ channels occurs. An outward movement of K+ ions causes repolarization.
C: Letter C represents hyperpolarization. A continued outward movement of K+ ions causes hyperpolarization and membrane potential goes beyond the resting membrane potential that is upto -90 mV.
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