22.4–22.7 Nutrients are grouped into six categories.
There are six groups of essential nutrients in our diet. They supply energy, raw materials, and the substances necessary for maintenance of the body’s systems.
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Question 22.29
Which of the following statements about the small intestine is incorrect?
- a) It is the primary site of digestion and absorption of nutrients into the bloodstream.
- b) It is the chief site of absorption of water by the digestive system.
- c) It is the longest part of the digestive tract.
- d) It receives secretions from the gallbladder.
- e) It is the part of the digestive tract where all food macromolecules can be broken down into absorbable monomers.
Question 22.30
To leave the digestive tract and enter the cells of the body, a substance must cross a cell membrane. During which stage of digestion does this take place?
- a) peristalsis
- b) absorption
- c) elimination
- d) chemotaxis
- e) ingestion
Question 22.31
Digestion and absorption:
- a) involve the breakdown of food into small nutrient molecules (absorption) and the passage of those molecules into the bloodstream (digestion).
- b) both occur primarily in the large intestine, or colon.
- c) are terms that describe the same process.
- d) both occur primarily in the stomach.
- e) involve the breakdown of food into small nutrient molecules (digestion) and the passage of those molecules into the bloodstream (absorption).
Question 22.32
In the mammalian digestive system, vitamin-
- a) small intestine.
- b) esophagus.
- c) mouth.
- d) large intestine.
- e) stomach.
