Podcast
Questions and Answers
What is the typical resting membrane potential in neurons?
What is the typical resting membrane potential in neurons?
- -30 millivolts (mV)
- -90 millivolts (mV)
- -70 millivolts (mV) (correct)
- -50 millivolts (mV)
What causes the change from negative to positive membrane potential during the depolarization phase of action potentials?
What causes the change from negative to positive membrane potential during the depolarization phase of action potentials?
- Efflux of calcium ions
- Influx of chloride ions
- Rapid influx of sodium ions (correct)
- Outward movement of potassium ions
What restores the negative membrane potential during the repolarization phase of action potentials?
What restores the negative membrane potential during the repolarization phase of action potentials?
- Efflux of calcium ions
- Influx of chloride ions
- Outward movement of potassium ions (correct)
- Influx of sodium ions
What is the role of resting membrane potential in neurologic transmission?
What is the role of resting membrane potential in neurologic transmission?
What allows passive movement of K+ out of the cell, contributing to the resting membrane potential?
What allows passive movement of K+ out of the cell, contributing to the resting membrane potential?
What briefly becomes more negative than the resting state before returning to the resting potential during action potentials?
What briefly becomes more negative than the resting state before returning to the resting potential during action potentials?
What actively transports ions, contributing to the establishment of resting membrane potential?
What actively transports ions, contributing to the establishment of resting membrane potential?
What permits a small influx of Na+ and contributes to the establishment of resting membrane potential?
What permits a small influx of Na+ and contributes to the establishment of resting membrane potential?
What serves as the basis for communication between neurons and with target cells?
What serves as the basis for communication between neurons and with target cells?
Where are action potentials initiated?
Where are action potentials initiated?
What principle states that action potentials either occur fully or do not occur at all?
What principle states that action potentials either occur fully or do not occur at all?
What influences the frequency of action potentials?
What influences the frequency of action potentials?
What insulates axons, increasing the speed of action potential conduction?
What insulates axons, increasing the speed of action potential conduction?
What facilitates saltatory conduction along myelinated axons?
What facilitates saltatory conduction along myelinated axons?
What generally increases the speed of action potential conduction?
What generally increases the speed of action potential conduction?
What can influence the ease of action potential initiation by affecting the proximity of the resting membrane potential to the threshold?
What can influence the ease of action potential initiation by affecting the proximity of the resting membrane potential to the threshold?
What can influence action potential conduction by altering extracellular and intracellular ion concentrations?
What can influence action potential conduction by altering extracellular and intracellular ion concentrations?
