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

Anatomy & Physiology

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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.

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A substance that induces fever is known as a(n) __________.

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At the blastocyst stage, the cells are considered

A) pluripotent. B) endodermal. C) extraembryonic. D) totipotent.

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