Antigen-presenting cells located in the epithelia of the skin are called
A) keratinocytes.
B) squamous macrophages.
C) germinative cells.
D) dendritic cells.
E) Merkel cells.
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Question 2) The area of the motor cortex that is devoted to a particular region of the body is proportional to the
A) size of the body area.
B) distance of the body area from the brain.
C) number of motor units in that region.
D) number of sensory receptors in the area of the body.
E) size of the nerves that serve the area of the body.
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Question 3) CD8 markers are to ________ T cells as CD4 markers are to ________ T cells.
A) suppressor; cytoxic
B) cytoxic; helper
C) helper; suppressor
D) NK; cytoxic
E) plasma; NK
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Question 4) The corticospinal system is often referred to as the
A) red nucleus.
B) reticular formation.
C) spinothalamic tracts.
D) pyramidal system.
E) medullary centers.
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Question 5) In order for a lymphocyte to respond to an antigen, the antigen must
A) be phagocytized by the lymphocyte.
B) enter the cytoplasm of the lymphocyte.
C) bind to the DNA of the lymphocyte.
D) bind to specific receptors on the lymphocyte surface.
E) depolarize the lymphocyte.
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Question 6) Upper motor neurons of the corticospinal tract synapse with neurons in
A) autonomic ganglia.
B) the anterior gray horns of the spinal cord.
C) the spinothalamic tract.
D) the lateral gray horns of the spinal cord.
E) the dorsal root ganglia.
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Question 7) T cells and B cells can be activated only by
A) pathogens.
B) interleukins, interferons, and colony-stimulating factors.
C) cells infected with viruses, bacteria, or cancer cells.
D) exposure to a specific antigen at a specific site in a plasma membrane.
E) disease-causing agents.
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Question 8) The pyramidal system provides
A) voluntary control over skeletal muscles.
B) voluntary control over smooth muscles.
C) involuntary control over skeletal muscles.
D) involuntary control over smooth muscles.
E) involuntary control over cardiac muscle.
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Question 9) Helper T cells do all of the following except
A) trigger B-cell division, plasma cell maturation, and antibody production.
B) provide a rapid response to a future exposure to the antigen.
C) enhance production of memory and cytotoxic T cells.
D) attract macrophages to the affected area.
E) enhance nonspecific defenses.
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Question 10) The medial pathway that controls involuntary movements of head, neck, and arm position in response to sudden visual and auditory stimuli is the ________ tract.
A) lateral corticospinal
B) tectospinal
C) rubrospinal
D) reticulospinal
E) vestibulospinal
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