题目内容

According to this TED speech, what are the four main components of the digestive system?

A. gastrointestinal tract
B. accessory organs of digestive system
C. the body’s enzymes, hormones, nerves, and blood
D. mesentery

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A trio of organs that “break down food using an array of special juices” include the following organs except. （单选题）

A. pancreas
B. liver
C. duodenum
D. gallbladder

____supports and positions all digestive organs in the abdomen.

The enzymes of the pancreatic and intestinal juices break proteins into , carbohydrates into, and fat molecules into fatty acids and.

The byproducts of digestion exit through the____