In the alveoli
A. oxygen diffuses into the blood while carbon dioxide diffuses out of the blood.
B. oxygen diffuses out of the blood while carbon dioxide diffuses into the blood.
C. both oxygen and carbon dioxide diffuse out of the blood.
D. both oxygen and carbon dioxide diffuse into the blood.
E. no exchange with the blood occurs.
A. oxygen diffuses into the blood while carbon dioxide diffuses out of the blood.
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A diagnostic test for M. tuberculosis exposure
A) utilizes an inflammatory reaction that occurs if there has been previous exposure to M. tuberculosis antigens. B) relies on previous tuberculin vaccination. C) uses an antiserum to detect antibodies in the blood that are only formed if there has been previous exposure to M. tuberculosis antigens. D) relies on an innate immune response that occurs only if there has been previous exposure to M. tuberculosis antigens.
Wound healing can be slowed by the presence of
A. normal microbiota. B. antiseptic ointments. C. sweat. D. foreign matter.
Most rainfall returns water directly to ____
a. lakes b. rivers c. groundwater d. oceans e. plants
The cell-mediated response involves all of the
following EXCEPT a. dendritic cells with antigen-MHC complexes. b. production of helper T cells. c. production of cytokines. d. production of cytotoxic cells. e. production of antibodies