Saltatory propagation differs from continuous propagation in that ________.
A) saltatory propagation occurs when an action potential moves from node to node along myelinated axons
B) saltatory propagation is slower than continuous propagation.
C) continuous propagation occurs when an action potential moves from node to node along unmyelinated axons
D) There is no difference between the two types of action potential propagation.
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Question 2) Which of the following statements is correct?
A) Myelin sheaths form an insulating layer around the axons of neurons in the central and peripheral nervous systems. These structures function to slow the transmission of impulses along the axon.
B) Myelin sheaths form an insulating layer around the axons of neurons in the central and peripheral nervous systems. These structures function to speed up the transmission of impulses along the axon.
C) Myelin sheaths form an insulating layer around the axons of neurons only in the peripheral nervous system. These structures function to speed up the transmission of impulses along the axon.
D) Myelin sheaths form an insulating layer around the cell bodies of neurons in the central and peripheral nervous systems. These structures function to speed up the transmission of impulses along the axon.
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Question 3) ________ form myelin sheaths in the peripheral nervous system, whereas ________ form myelin sheaths in the central nervous system.
A) Astrocytes; oligodendrocytes
B) Schwann cells; oligodendrocytes
C) Oligodendrocytes; Schwann cells
D) Astrocytes; ependymal cells
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Question 4) The ________ is the layer of connective tissue that surrounds a nerve.
A) fascicle
B) perineurium
C) epineurium
D) axon
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Question 5) The spinal nerves of the PNS are formed by the combination of ________.
A) white matter and gray matter
B) a ventral root and a dorsal root
C) an anterior horn and a posterior horn
D) a dorsal root ganglion and a ventral root
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Question 6) Complete the following statement: The posterior horn of the gray matter of the spinal cord ________.
A) contains the cell bodies of autonomic motor neurons in thoracic and lumbar spinal cord levels
B) contains the cell bodies of multipolar neurons that contribute motor fibers to spinal nerves
C) contains axons of sensory neurons and cell bodies of interneurons
D) is a narrow band of tissue that connects the gray matter on each side of the spinal cord
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Question 7) The three layers of the cerebellar cortex are the ________.
A) molecular layer, Purkinje cell layer, and the cerebellar nuclei
B) cerebrum, Purkinje cell layer, and the molecular layer
C) molecular layer, granular layer, and the arbor vitae
D) molecular layer, Purkinje cell layer, and the granular layer
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Question 8) ________ contains mostly myelinated axons, whereas ________ contains cell bodies, dendrites, and unmyelinated axon fibers.
A) White matter; gray matter
B) White matter; cerebral medulla
C) Gray matter; white matter
D) Cerebral cortex; white matter
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Question 9) Which of the following types of glial cells connect neurons to blood vessels, helps form the blood-brain barrier, and assists in the regulation of oxygen, carbon dioxide, and nutrients?
A) ependymal cells
B) astrocytes
C) Schwann cells
D) microglia
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Question 10) What group of cells provides support and protection for neurons?
A) oligodendrocytes
B) Schwann cells
C) ependymal cells
D) glial cells (or neuroglia)
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