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Week 7 Physiology
Actrivity
| Question | Answer |
|---|---|
| If the magnitude of the local depolarization surpasses a limit called the _____, voltage-gated Na+ channels are stimulated to open. | threshold potential |
| A term commonly used as a synonym for action potential is | nerve impulse. |
| The mechanisms that produce and maintain the resting membrane potential do so by producing a | slight excess of positive ions on the outer surface of the plasma membrane. |
| Movement of the membrane potential away from zero (below the usual RMP) is called | hyperpolarization. |
| The speed of a nerve impulse depends on the neuron’s resting potential. | False |
| Which membrane receptor acts to directly change ion permeability when stimulated? | Gated-channel receptor |
| In depolarization the membrane potential moves toward zero, whereas in hyperpolarization the membrane potential moves away from zero. | True |
| The tiny bulge at the end of a terminal branch of a presynaptic neuron’s axon is called a(n) | synaptic knob. |
| The membrane potential maintained by a nonconducting neuron’s plasma membrane is called the _____ membrane potential. | resting |
| The difference between sodium and potassium in the generation of action potential is that: | sodium causes depolarization of the cell membrane, and potassium causes repolarization of the cell membrane. |
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rayrayhere14