Podcast
Questions and Answers
What factors determine the time and length constants of a nerve membrane?
What factors determine the time and length constants of a nerve membrane?
- The membrane resistance and capacitance (correct)
- The number of action potentials generated
- The type of neurotransmitter released
- The size of the nerve fiber
How does an action potential differ from the subthreshold responses of a membrane?
How does an action potential differ from the subthreshold responses of a membrane?
- Action potential occurs only in sensory neurons, while subthreshold responses occur in motor neurons.
- Action potential is always inhibitory, while subthreshold responses can be excitatory or inhibitory.
- Action potential results from chemical signaling, while subthreshold responses are purely electrical.
- Action potential involves a rapid depolarization and repolarization of the membrane, while subthreshold responses are slower and do not reach the threshold for an action potential. (correct)
What is the sequence of conductances that underlies the action potential?
What is the sequence of conductances that underlies the action potential?
- Na+ influx followed by K+ efflux (correct)
- Na+ influx followed by Cl- efflux
- K+ influx followed by Na+ efflux
- Cl- influx followed by Na+ efflux
How are the responses of Na+ and K+ channels to membrane depolarization similar?
How are the responses of Na+ and K+ channels to membrane depolarization similar?
How do the gating properties of Na+ and K+ channels relate to the absolute and relative refractory periods of the action potential?
How do the gating properties of Na+ and K+ channels relate to the absolute and relative refractory periods of the action potential?
What is the nerve membrane's response to small-amplitude stimuli similar to?
What is the nerve membrane's response to small-amplitude stimuli similar to?
What causes the responses of Na+ and K+ channels to differ?
What causes the responses of Na+ and K+ channels to differ?
What shapes the electric responses of the nerve membrane?
What shapes the electric responses of the nerve membrane?
What underlies the action potential?
What underlies the action potential?
How do the gating properties of Na+ and K+ channels relate to the absolute and relative refractory periods of the action potential?
How do the gating properties of Na+ and K+ channels relate to the absolute and relative refractory periods of the action potential?
