After Sitting Through a 2-Hour Math Lecture, Your Stomach Is

After sitting through a 2-hour math lecture, your stomach is growling. You have just learned about surface area and its role in mathematics. Your classmate points out that surface area is also integral to the absorption of nutrients due to the ____.

A) protective effect of the gastric mucosa
B) relatively large size of digested protein molecules
C) enormous number of villi and microvilli in the small intestine
D) presence of both circular and longitudinal muscles in the GI tract

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