Physiology wk 7-13

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Which of the following is true of spatial summation?

Neurotransmitters released simultaneously from several presynaptic knobs converge on one postsynaptic neuron.

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Stimulus-gated channels open in response to:

sensory stimuli

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When current leaps across an insulating myelin sheath from node to node, the type of impulse conduction is called:

saltatory conduction.

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Within the nervous system, coding for the strength of a stimulus is accomplished through:

the frequency of nerve impulses.

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The only ion(s) that can diffuse across a neuron’s membrane when the neuron is at rest is (are):

potassium

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Serotonin is an example of a(n):

amine neurotransmitter

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Severe depression can be caused by a deficit in certain brain synapses of:

neuropeptides

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Which of the following antidepressants acts by blocking the action of monoamine oxidase (MAO)?

Phenelzine

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The fastest nerve fibers in the body can conduct impulses up to approximately _____ meters per second.

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For a neurotransmitter to produce an inhibitory postsynaptic potential, which of the following channels must open?

Potassium and/or chloride channels

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