Which statement about digestion in the small intestine is true?
A) Most digestion occurs in the stomach and most absorption occurs in the small intestine.
B) Fat in the small intestine is emulsified by bile that is produced by the gallbladder and stored in the liver.
C) Bile molecules in the small intestine have one end that is lipophobic and one end that is hydrophilic.
D) The pancreas secretes zymogens and bicarbonate ions into the duodenum of the small intestine.
E) Enterokinase is secreted by the pancreas to activate enzymes in the small intestine.

Question

Quizplus · Accepted Answer

The pancreas secretes zymogens (inactive enzyme precursors) and bicarbonate ions into the duodenum of the small intestine. This helps to neutralize the acidic chyme that enters the small intestine from the stomach and also provides the enzymes necessary for digestion of carbohydrates, proteins, and fats. Option A is incorrect because most digestion of carbohydrates, proteins, and fats occurs in the small intestine. Option B is partially correct but incomplete; bile is produced by the liver and stored in the gallbladder, and it does emulsify fats in the small intestine. Option C is partially correct but incomplete; bile molecules have one end that is hydrophilic and one end that is lipophilic. Option E is incorrect; enterokinase is produced by cells in the small intestine to activate trypsinogen (a zymogen secreted by the pancreas) into its active form, trypsin.

Which Statement About Digestion in the Small Intestine Is True