An illegal practice is found among some athletes who try to increase the normal number of RBCs in an attempt to boost oxygen delivery. This practice is called ________
A) blood doping
B) leukemia
C) bloodletting
D) bone marrow transplant
A
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Which of the following represents a long-distance signaling mechanism?
A. contact-to-contact signaling B. intercellular signaling C. autocrine signaling D. paracrine signaling E. endocrine signaling
The concept that human and animal diseases are caused by microorganisms is called the
A. disease theory. B. causative theory. C. germ theory. D. cell theory.
Sulfonamides and other drugs that inhibit folic acid synthesis have a high therapeutic index because ________.
A. humans do not use folic acid B. humans synthesize folic acid by a process that is not sensitive to sulfonamides C. humans do not synthesize folic acid but obtain it in their diets D. None of the choices are correct.
Growth of an organism and maintenance of the body are the main roles of meiosis
a. true b. false