The most active phagocytic cells in circulating blood are
A. neutrophils and macrophages.
B. neutrophils and monocytes.
C. lymphocytes and monocytes.
D. monocytes and macrophages.
Answer: B
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The movement of air into and out of the lung is called ________
A) Perspiration B) Respiration C) Evacuation D) Ventilation
Which of the following are TRUE of class I major histocompatibility complex (MHC) molecules?
A) Class I MHC molecules are only present on erythrocyte surfaces. B) Class I MHC molecules present exogenous antigens. C) Class I MHC molecules bind complement. D) Class I MHC molecules present endogenous antigens.
A substance that induces fever is known as a(n) __________.
A) opsonin. B) acute phase protein. C) pyrogen. D) chemotaxin. E) cytokine.
At the blastocyst stage, the cells are considered
A) pluripotent. B) endodermal. C) extraembryonic. D) totipotent.