The role of physical activity in the prevention of colon cancer is identified by which of the fol-lowing?
a. It increases fluid loss, leading to thirst and increased fluid intake, hydrating the co-lon.
b. It increases blood supply, thereby increas-ing oxygen to the colon.
c. It increases gut motility, thereby decreas-ing the time the bowel is exposed to mu-tagens.
d. It increases the secretion of hydrochloric acid, thereby killing mutants.
ANS: C
Physical activity increases gut motility, thereby decreasing exposure to mutagens. Physical activ-ity does increase fluid loss and blood supply, but neither effect prevents mutagens. Physical ac-tivity does not increase hydrochloric acid.
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