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The Digestive System Practice Questions

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Updated on Sep 22, 2011

Review these concepts at: The Digestive System Study Guide

Practice Questions

1. The function of the digestive system is to break down food molecules and distribute them to the body so that

a. the liver can break down starches.

b. the cells can break down proteins.

c. the lungs can engage in respiration.

d. the cells can engage in cellular respiration.

2. Chyme enters the small intestine

a. devoid of all nutritional value.

b. with all food molecules completely broken down.

c. with some food molecules partially broken down.

d. where it is not exposed to enzymes.

3. Once food reaches the cells, it is subjected to cellular respiration and what other two metabolic processes?

a. circulation and breathing

b. anabolism and catabolism

c. integration and summation

d. ingestion and inhalation

4. Anabolism is a metabolic process that

a. breaks large molecules into smaller ones.

b. combines small molecules into larger ones.

c. distributes oxygen evenly throughout the body.

d. consumes protein molecules.

5. Which of the following is NOT an accessory organ of the digestive system?

a. liver

b. pancreas

c. gall bladder

d. urinary bladder

6. The chief function of the colon is to

a. absorb water from undigested waste.

b. produce sugars.

c. absorb protein from undigested waste.

d. produce carbohydrates.

Answers

1. d. Food molecules must be broken down into their constituent molecules and be small enough to be absorbed, transported, and then reabsorbed by the cells. The cells will then use this energy in the chemical bonds of the broken-down food molecules for cellular respiration.

2. c. Chyme is the slurry that exits in the stomach and enters the small intestine. At this point, some of the foodstuffs in chyme have been broken down (some starch and a lot of the proteins). More digestion takes place as the food moves through the small intestine where many enzymes are present.

3. b. The two metabolic processes that molecules are subjected to at the cellular level are anabolism and catabolism. Cellular respiration is a type of catabolism because a larger molecule (glucose) is broken down to very small molecules (carbon dioxide and water). Anabolism occurs when the cell produces proteins from the free amino acids resulting from the breakdown of proteins in the digestive system.

4. b. Anabolism combines smaller molecules into larger ones.

5. d. The urinary bladder is part of the excretory system.

6. a. The absorption of water from undigested food occurs in the colon.

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