Action Potential

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Questions and Answers

What is the main purpose of the action potential in a neuron?

  • Producing contraction in muscle cells
  • Balancing ion leakage and ion pumping
  • Producing the nerve impulse (correct)
  • Creating a negative electric polarization

What is the typical resting potential of a polarized neuron or muscle cell?

  • -50 mV
  • +75 mV
  • -100 mV
  • -75 mV (correct)

What describes the steady state of a cell's membrane potential?

  • Action potential generation
  • Depolarization
  • Ion leakage imbalance
  • Resting membrane potential (correct)

What is the primary factor that drives sodium ions into the cell during depolarization?

<p>Concentration gradient of sodium ions (A)</p> Signup and view all the answers

What initiates the generation of an action potential in a cell?

<p>Channel opening for Na+ in the membrane (D)</p> Signup and view all the answers

How does depolarization affect the membrane potential?

<p>Moves it toward zero (A)</p> Signup and view all the answers

What is the membrane potential when sodium channels open completely?

<p>-55 mV (D)</p> Signup and view all the answers

What happens to the membrane potential when other voltage-gated channels specific for potassium ion start opening?

<p>Depolarizes to +35 mV (A)</p> Signup and view all the answers

What occurs when potassium ions leave the cell during repolarization?

<p>Membrane potential moves back toward its resting voltage (A)</p> Signup and view all the answers

What happens when potassium ions reach equilibrium during hyperpolarization?

<p>Membrane voltage goes below -70 mV (B)</p> Signup and view all the answers

What is the significance of the short overshoot in membrane potential during hyperpolarization?

<p>K+ channels remain open longer than expected (D)</p> Signup and view all the answers

Which ion is responsible for repolarization of the membrane potential?

<p>Potassium ion (A)</p> Signup and view all the answers

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