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Questions and Answers

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The basic neuronal signaling unit is–

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A. the equilibrium potential

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B. the action potential

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C. the resting potential

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D. the supernormal period

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The answer is B.

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In a motor neuron at rest, an excitatory synapse produces an EPSP of 15 mV, and an inhibitory synapse produces an IPSP of 5 mV. If both the EPSP and IPSP occur simultaneously, then the motor neuron would–

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A. depolarize by about 10 mV

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B. depolarize by 20 mV

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C. depolarize by more than 20 mV

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D. change its potential by less than 1 mV

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The answer is A.

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The equilibrium potential for K+ in neurons is ordinarily nearest–

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A. the equilibrium potential for Na+

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B. resting potential

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C. reversal potential for the EPSP

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D. the peak of the action potential

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The answer is B.

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Generation of the action potential–

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A. depends on depolarization caused by the opening of K+ channels

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B. depends on hyperpolarization caused by the opening of K+ channels

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C. depends on depolarization caused by the opening of Na+ channels

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D. depends on hyperpolarization caused by the opening of Na+ channels

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E. depends on second messengers

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The answer is C.

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The cerebrum consists of the–

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A. thalamus and basal ganglia

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B. telencephalon and midbrain

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C. telencephalon and diencephalon

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D. brain stem and prosencephalon

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E. cerebellum and prosencephalon

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The answer is C.

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The somatic nervous system innervates the–

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A. blood vessels of the skin

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B. blood vessels of the brain

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C. muscles of the heart

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