100 Top Nero Anatomy Multiple Choice Questions And Answers

1. 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.

2. 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.

3. 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.

4. ATP provides an essential energy source in the CNS for–
A. division of neurons
B. maintenance of ionic gradients via ATPase
C. generation of action potentials
D. EPSPs and IPSPs
The answer is B.

5. The peripheral nervous system–
A. includes the spinal cord
B. is sheathed in fluid-filled spaces enclosed by membranes
C. includes cranial nerves
D. does not include spinal nerves
E. is surrounded by bone
The answer is C.

6. The somatic nervous system innervates the–
A. blood vessels of the skin
B. blood vessels of the brain
C. muscles of the heart
D. muscles of the body wall
E. muscles of the viscera
The answer is D.

7. Myelin is produced by–
A. oligodendrocytes in the CNS and Schwann cells in the PNS
B. Schwann cells in the CNS and oligodendrocytes in the PNS
C. oligodendrocytes in both CNS and PNS
D. Schwann cells in both CNS and PNS
The answer is A.

8. Astrocytes–
1. may function to buffer extracellular K+
2. are interconnected by gap junctions
3. can proliferate to form a scar after an injury
4. migrate to the CNS from bone marrow
One or more answers may be correct. Select–
A. if 1, 2, and 3 are correct
B. if 1 and 3 are correct
C. if 2 and 4 are correct
D. if only 4 is correct
E. if all are correct
The answer is A.

9. The cell layer around the central canal of the spinal cord–
1. is called the ventricular zone
2. is the same as the pia
3. encloses cerebrospinal fluid
4. is called the marginal zone
One or more answers may be correct. Select–
A. if 1, 2, and 3 are correct
B. if 1 and 3 are correct
C. if 2 and 4 are correct
D. if only 4 is correct
E. if all are correct
The answer is B.

10. A spinal motor neuron in an adult–
1. maintains its membrane potential via the active transport of sodium and potassium ions
2. synthesizes protein only in the cell body and not in the axon
3. does not synthesize DNA for mitosis
4. does not regenerate its axon following section of its peripheral portion
One or more answers may be correct. Select–
A. if 1, 2, and 3 are correct
B. if 1 and 3 are correct
C. if 2 and 4 are correct
D. if only 4 is correct
E. if all are correct
The answer is A.

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