Circular folds and intestinal villi
A) increase the surface area of the mucosa of the small intestine.
B) carry products of digestion that will not pass through the walls of blood capillaries.
C) produce new cells for the mucosa of the small intestine.
D) secrete digestive enzymes.
E) produce hormones.
Answer: A
Anatomy & Physiology
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Fill in the blank with the correct word.
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The erectile tissue that surrounds the urethra is the
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