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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?

Concentration gradient of sodium ions Signup and view all the answers

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

Channel opening for Na+ in the membrane Signup and view all the answers

How does depolarization affect the membrane potential?

Moves it toward zero Signup and view all the answers

What is the membrane potential when sodium channels open completely?

-55 mV Signup and view all the answers

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

Depolarizes to +35 mV Signup and view all the answers

What occurs when potassium ions leave the cell during repolarization?

Membrane potential moves back toward its resting voltage Signup and view all the answers

What happens when potassium ions reach equilibrium during hyperpolarization?

Membrane voltage goes below -70 mV Signup and view all the answers

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

K+ channels remain open longer than expected Signup and view all the answers

Which ion is responsible for repolarization of the membrane potential?

Potassium ion Signup and view all the answers