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PHYS Final
| Question | Answer |
|---|---|
| The brief period during which a local area of an axon's membrane resists re-stimulation is called the ___________ period. | Refractory |
| When neurotransmitters from synaptic knobs stimulate a postysynaptic neuron in rapid succession, their effect can add up over a brief period to produce an action potential. This is called | temporal summation. |
| Neurons are the only living cells that maintain a difference in the concentration of ions across their membranes. | False |
| 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. |
| Whether an impulse is continued through the neuron depends on the magnitude of the voltage in the axon hillock. | True |
| What mechanism quickly terminates the action of a neurotransmitter once it binds to its postsynaptic receptor? | Neurotransmitter molecules are transported into nearby glial cells. Neurotransmitter molecules are metabolized into inactive compounds. Neurotransmitter molecules are transported back into synaptic knobs. |
| An ion channel that opens in response to a sensory stimulus is a(n) | stimulus-gated channel. |
| If the threshold potential is surpassed, the full peak of the action potential is always reached. | True |
| There are two types of synapses -- the electrical synapse and the _________ synapse. | Chemical |
| A neurologist is using a voltmeter to measure potential. The membrane potential of a neuron was recorded at +30mV. This is what type of membrane potential? | Action |
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jadenmikelle
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