The formation of stool is relatively unaffected by the patient's diet. Why is this?
A) Digested food is all mixed together, and the colon can't tell what is food and what isn't.
B) Water is reabsorbed from the bloodstream and used to compact the fecal mass.
C) Feces are formed in the rectum, and all dietary components are already absorbed by the body.
D) A large portion of the fecal mass is of nondietary origin.
Ans: D
Feedback: The composition is relatively unaffected by alterations in diet because a large portion of the fecal mass is of nondietary origin, derived from the secretions of the GI tract. Options A, B, and C are incorrect
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