Which of the following describes the concentration of K+ and Na+ ions in and around a resting neuron? 1- K+ and Na+ ion concentrations are both higher outside of the cell. 2- K+ ion concentration is higher inside of the cell, Na+ ion concentration is higher outside of the cell. 3- K+ ion concentration is higher outside of the cell, Na+ ion concentration is higher inside of the cell. 4- K+ and Na+ ion concentrations are similar inside of and outside of the cell. - An action potential: 1- is a large change in polarization. 2- is an "all-or-nothing" response. 3- will travel down the length of the axon 4- all of the above - What prevents action potentials from traveling away from synaptic terminals? 1- Inactivation of Na+ channels behind the zone of depolarization. 2- Inactivation of K+ channels behind the zone of depolarization. 3- An increased in graded potential along the length of the axon. 4- All of the above - Which brain region is incorrectly paired with one of its functions? 1- midbrain - learning 2- hindbrain - coordination of motor activities 3- hindbrain - involuntary activities 4- forebrain - sleep
- Which of the following describes the concentration of K+ and Na+ ions in and around a resting neuron?
1- K+ and Na+ ion concentrations are both higher outside of the cell.
2- K+ ion concentration is higher inside of the cell, Na+ ion concentration is higher outside of the cell.
3- K+ ion concentration is higher outside of the cell, Na+ ion concentration is higher inside of the cell.
4- K+ and Na+ ion concentrations are similar inside of and outside of the cell.
- An action potential:
1- is a large change in polarization.
2- is an "all-or-nothing" response.
3- will travel down the length of the axon
4- all of the above
- What prevents action potentials from traveling away from synaptic terminals?
1- Inactivation of Na+ channels behind the zone of depolarization.
2- Inactivation of K+ channels behind the zone of depolarization.
3- An increased in graded potential along the length of the axon.
4- All of the above
- Which brain region is incorrectly paired with one of its functions?
1- midbrain - learning
2- hindbrain - coordination of motor activities
3- hindbrain - involuntary activities
4- forebrain - sleep
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