Questions and Answers

Questions and Answers

The basic neuronal signaling unit is–

A. the equilibrium potential

B. the action potential

C. the resting potential

D. the supernormal period

The answer is B.

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–

A. depolarize by about 10 mV

B. depolarize by 20 mV

C. depolarize by more than 20 mV

D. change its potential by less than 1 mV

The answer is A.

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

A. the equilibrium potential for Na⁺

B. resting potential

C. reversal potential for the EPSP

D. the peak of the action potential

The answer is B.

Generation of the action potential–

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

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

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

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

E. depends on second messengers

The answer is C.

The cerebrum consists of the–

A. thalamus and basal ganglia

B. telencephalon and midbrain

C. telencephalon and diencephalon

D. brain stem and prosencephalon

E. cerebellum and prosencephalon

The answer is C.

The somatic nervous system innervates the–

A. blood vessels of the skin

B. blood vessels of the brain

C. muscles of the heart