12 Questions
What is the main purpose of the action potential in a neuron?
Producing the nerve impulse
What is the typical resting potential of a polarized neuron or muscle cell?
-75 mV
What describes the steady state of a cell's membrane potential?
Resting membrane potential
What is the primary factor that drives sodium ions into the cell during depolarization?
Concentration gradient of sodium ions
What initiates the generation of an action potential in a cell?
Channel opening for Na+ in the membrane
How does depolarization affect the membrane potential?
Moves it toward zero
What is the membrane potential when sodium channels open completely?
-55 mV
What happens to the membrane potential when other voltage-gated channels specific for potassium ion start opening?
Depolarizes to +35 mV
What occurs when potassium ions leave the cell during repolarization?
Membrane potential moves back toward its resting voltage
What happens when potassium ions reach equilibrium during hyperpolarization?
Membrane voltage goes below -70 mV
What is the significance of the short overshoot in membrane potential during hyperpolarization?
K+ channels remain open longer than expected
Which ion is responsible for repolarization of the membrane potential?
Potassium ion
Explore the concept of action potential in neurons and muscle cells, understanding how nerve impulses and muscle contractions are generated. Learn about the electric polarization and ion concentrations involved in maintaining the cell's resting state.
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