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Week 7 Nerve
Human Physiology Nervous System
| Question | Answer |
|---|---|
| If the threshold potential is surpassed, the full peak of the action potential is always reached. | True |
| 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 |
| In a myelinated fiber, the action potential jumps from one node of Ranvier to the next. | True |
| The active transport mechanism in the plasma membrane that transports sodium and potassium ions in opposite directions and at different rates is the | sodium-potassium pump |
| A synapse can occur only between an axon and: | any of the above. |
| When neurotransmitters from synaptic knobs stimulate a postsynaptic neuron in rapid succession, their effect can add up over a brief period to produce an action potential. This is called | temporal summation. |
| Whether an impulse is continued through the neuron depends on the magnitude of the voltage in the axon hillock. | True |
| A neurologist is using a voltmeter to measure potential. The membrane potential of a neuron was recorded at +30 mV. This is what type of membrane potential? | Action |
| 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 |
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