KIN 223 Chapter 12 Final Exam And
Answers.
Depolarization of a cell membrane occurs because - Answer More sodium ions diffuse into the cell than
potassium ions diffuse out of it
At resting membrane potential, voltage-gated potassium ion channels are open. - Answer false
Depolarization is initiated by a stimulus that makes the membrane potential - Answer more positive
Reestablishment of the resting membrane potential occurs through - Answer active transport of
sodium and potassium ions
A recently depolarized area of a cell membrane cannot generate an action potential because of the -
Answer absolute refractory period
The inside of the cell membrane becomes negative at the time of an action potential. - Answer false
The cell membrane immediately adjacent to an action potential depolarizes because of - Answer local
currents
The absolute refractory period assures that action potential propagation is - Answer only in one
direction
Action potentials arriving at a presynaptic terminal cause - Answer calcium ion channels to open
Synaptic vesicles of somatic neurons contain - Answer acetylcholine
Acetylcholine is released into the synaptic cleft under the influence of - Answer calcium ions
Answers.
Depolarization of a cell membrane occurs because - Answer More sodium ions diffuse into the cell than
potassium ions diffuse out of it
At resting membrane potential, voltage-gated potassium ion channels are open. - Answer false
Depolarization is initiated by a stimulus that makes the membrane potential - Answer more positive
Reestablishment of the resting membrane potential occurs through - Answer active transport of
sodium and potassium ions
A recently depolarized area of a cell membrane cannot generate an action potential because of the -
Answer absolute refractory period
The inside of the cell membrane becomes negative at the time of an action potential. - Answer false
The cell membrane immediately adjacent to an action potential depolarizes because of - Answer local
currents
The absolute refractory period assures that action potential propagation is - Answer only in one
direction
Action potentials arriving at a presynaptic terminal cause - Answer calcium ion channels to open
Synaptic vesicles of somatic neurons contain - Answer acetylcholine
Acetylcholine is released into the synaptic cleft under the influence of - Answer calcium ions
