Course: Histology / Cell Biology Thread Topic: Neurons, Nerves

Question 1

Select the single best answer to the numbered question.

The autonomic nervous system


A. is used to increase but not decrease cardiac muscle activity
B. innervates skeletal but not smooth muscle
C. can stimulate secretion of glands like the pancreas
D. only contains parasympathetic fibers
E. all of the above
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Question 2

Select the single best answer to the numbered question.

The blood-nerve barrier is established by


A. epineurium
B. perineurium
C. endoneurium
D. oligodendrocytes
E. Schwann cells
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Question 3

Select the single best answer to the numbered question.

Evidence that nervous tissue in the CNS is metabolically very active is provided by all of the following observations EXCEPT


A. neurons have a large heterochromatic nucleus
B. neurons have large, densely staining nucleoli
C. neurons have numerous Nissl bodies in their perikaryon
D. gray matter is extensively vascularized
E. even brief anoxia can cause irreversible changes in CNS function
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Question 4

Select the single best answer to the numbered question.

Which of the following statements about myelination is correct?


A. Nerves always contain myelinated axons.
B. A single oligodendroglial cell can myelinate the entire length of an axon in the CNS.
C. A single Schwann cell can provide myelin for multiple axons in the PNS.
D. A single Schwann cell can enclose multiple unmyelinated axons in the PNS.
E. Myelin is derived from the plasma membrane of the axon.
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Question 5

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Which of the following morphological features of brain capillaries is most central to the functional blood-brain barrier?


A. tight junctions between endothelial cells
B. a basement membrane
C. intracellular vesicles
D. pericytes
E. fenestrations in the endothelial cells
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Question 6

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Which of the following statements about a myelinated axon of the CNS is correct?


A. the myelin is provided for this axon by Schwann cells
B. the axonal plasma membrane has a uniform distribution of voltage-regulated sodium channels
C. there are multiple nodes of Ranvier
D. the axoplasm lacks mitochondria
E. this axon is surrounded by a delicate connective tissue called endomysium
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Question 7

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Gray matter is to white matter as


A. fibrous astrocytes are to protoplasmic astrocytes
B. oligodendroglial cells are to Schwann cells
C. ganglia are to nerves
D. synapses are to motor end plates
E. axons are to dendrites
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Question 8

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Movement of membrane organelles within the neuronal axon in a direction away from the cell body is due to the activity of


A. arp2/3
B. dynein
C. kinesin
D. laminin
E. integrin
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Question 9

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If axons in the PNS are transected (cut), then the neurons associated with these axons will exhibit all of the following features EXCEPT


A. loss of Nissl staining (chromatolysis)
B. displacement of the nucleus
C. increase in the number of dendrites
D. swelling of the soma (neuronal cell body)
E. degeneration of the portion of the axon distal to the cut
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Question 10

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Which of the following best describes tissue in the CNS?


A. there is much connective tissue present
B. there are abundant capillaries present
C. there are more neurons than glial cells present
D. there are many tight junctions holding neurons together
E. there is an active repair mechanism that can replace neurons that die
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Question 11

Select the single best answer to the numbered question.

a nerve is always characterized by


A. the presence of either all myelinated or all unmyelinated axons
B. the presence of either all sensory or all motor axons
C. multiple axons bundled together by connective tissue
D. the presence of oligodendroglial cells
E. nodes of Ranvier
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