Action Potential Overview

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Questions and Answers

What occurs during an action potential in terms of membrane polarity?

  • The membrane maintains its resting potential throughout the process.
  • The inside of the membrane becomes negative while the outside becomes positive.
  • Both the inside and outside of the membrane become equally positive.
  • The inside of the membrane becomes positive and the outside becomes negative. (correct)

How many reversals of polarity are involved in an action potential?

  • Two reversals of polarity. (correct)
  • One reversal of polarity only.
  • Four or more reversals of polarity.
  • Three distinct reversals of polarity.

Which of the following ions is primarily involved in the depolarization of a membrane during an action potential?

  • Calcium ions (Ca²⁺)
  • Sodium ions (Na⁺) (correct)
  • Chloride ions (Cl⁻)
  • Potassium ions (K⁺)

What is the effect of hyperpolarization on a membrane potential?

<p>It prevents the generation of an action potential. (D)</p> Signup and view all the answers

Which statement about membrane potential is true?

<p>Action potential is characterized by a rapid reversal of membrane polarity. (C)</p> Signup and view all the answers

Flashcards

Action Potential

A rapid change in the electrical potential across a cell membrane, where the inside becomes briefly positive relative to the outside.

Depolarization

The process of making the inside of a cell more positive, bringing it closer to the threshold for an action potential.

Hyperpolarization

The process of making the inside of a cell more negative, moving it further away from the threshold for an action potential.

Ion Movement

The movement of ions across a cell membrane, which creates a change in the electrical potential.

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Two Reversals of Polarity

Two distinct shifts in the electrical polarity of a cell during an action potential. First, a rapid depolarization where the inside becomes positive, followed by a repolarization where the inside returns to its negative resting state.

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Study Notes

Action Potential Overview

  • Action potential is a rapid change in membrane polarity
  • Inside of the membrane becomes positive, outside becomes negative
  • Two polarity reversals are characteristic of the process
  • Ions are crucial for membrane depolarization and hyperpolarization

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