Positive selection of lymphocytes refers to the
A. proliferation of natural killer cells.
B. replication of memory cells.
C. production of antigen-specific antibodies.
D. processing of an antigen by a macrophage.
E. survival of pre-B and pre-T cells that are capable of an immune response.
Answer: E
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Blood vessels in the ________ supply epidermal cells with nutrients.
A. epidermis B. hair follicle C. stratum basale D. dermis
The major divisions of the autonomic nervous system (ANS) include
A) pre - and postganglionic fibers. B) the sympathetic and parasympathetic divisions. C) the voluntary and involuntary divisions. D) the conscious and unconscious nervous systems. E) None of the answers are correct.
The bending of light as it passes through different media is called ________.
A. astigmatism B. refraction C. visual acuity D. accommodation
Histamine is a mediator of inflammatory responses that is generated by enzymatic cleavage of a plasma precursor
Indicate whether the statement is true or false.