Natural killer cells
A) engulf and destroy invading bacteria.
B) are located on the surface of the skin.
C) destroy body cells that have been invaded by viruses.
D) are a type of lymphocyte.
E) produce secretions that inhibit the growth of pathogenic microbes.
C
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Which of the following statements about gastrin is false?
A. Gastrin secretion is initiated in response to the sight or smell of food. B. A low pH in the stomach inhibits the secretion of gastrin. C. Gastrin stimulates the production of HCl. D. Gastrin is produced by the stomach, absorbed within the small intestine, and recirculated back to the stomach. E. None of these statements about gastrin is false.
As oxygenated blood enters tissue capillaries, the oxygen ____
a. binds more tightly to hemoglobin b. diffuses from blood plasma into body cells c. diffuses from interstitial fluid into blood plasma d. acts as a substrate for carbonic anhydrase e. reaches equilibrium in blood plasma and interstitial fluid
Four of the five answers listed below possess a complete digestive system. Select the exception.
a. human b. bird c. earthworm d. planaria
The similar body shape and color of dolphins and sharks is an example of ____
a. variations in master genes b. homologous structures c. anatomical homology d. convergent evolution e. divergent evolution