What body signal, interpreted by the brain stem, will cause the diaphragm to contract?

A) levels of oxygen in the blood
B) levels of carbon dioxide in the blood
C) levels of carbon monoxide in the blood
D) levels of hemoglobin in the blood


B

Biology & Microbiology

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If the partial pressure of oxygen (pO2) in a man's blood plasma decreased below that in his red blood cells, what would be the result?

A. More oxygen would diffuse into his red blood cells and be transported throughout his body. B. Oxygen would diffuse out of his red blood cells, and less oxygen would be transported throughout his body. C. The concentration of oxygen would be the same in red blood cells and blood plasma.

Biology & Microbiology

Immune complexes

A. consist of antigen-antibody bound together. B. are usually cleared rapidly from the body. C. bind to Fc receptors on cells. D. are involved in type III hypersensitivity reactions. E. All of the choices are correct.

Biology & Microbiology

During transcription, the sequence of one strand of a DNA molecule is copied into a related molecule, known as a

A) gene. B) messenger RNA. C) protein. D) genome.

Biology & Microbiology

In the accompanying diagram, ____ is labeled "D"

a. the appendix b. the cecum c. a polyp d. a portion of the small intestine e. the colon

Biology & Microbiology