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4 Digestion and Nutrient Absorption Online Quiz Questions

Use this free practice quiz with 20 questions to review 4 Digestion and Nutrient Absorption, test your knowledge, and prepare for your next test or exam.

20 questions
01
Choose one
1 point

Acidic chyme leaves the stomach and enters the small intestine. Which secretion helps neutralize its acidity?

  1. A

    Bile from the gallbladder

  2. B

    Bicarbonate from the pancreas

  3. C

    Pepsin from the stomach

  4. D

    Saliva from the mouth

02
True or false
1 point

True or false: Vitamins generally must be broken into smaller molecules by digestive enzymes before they can be absorbed.

  1. A

    True

  2. B

    False

03
Written response
1 point

What muscular process moves a swallowed bolus through the esophagus toward the stomach?

04
Choose one
1 point

After food is mixed with acid and enzymes in the stomach, what is the resulting semifluid mixture called?

  1. A

    Bolus

  2. B

    Chylomicron

  3. C

    Chyme

  4. D

    Stool

05
Fill in the blank
1 point

The small intestine has three sections. Its first section is the , and its last section is the .

06
Choose one
1 point

A meal contains a large amount of dietary fat. What role does bile play in its digestion?

  1. A

    It splits triglycerides directly into fatty acids.

  2. B

    It disperses fat into small droplets for enzyme action.

  3. C

    It converts amino acids into proteins.

  4. D

    It carries sugars from the intestine to the liver.

07
Choose all
1 point

Which actions are examples of mechanical digestion? Select all that apply.

  1. A

    Chewing food into smaller pieces

  2. B

    Enzymes splitting large molecules into smaller units

  3. C

    Stomach churning food with digestive fluids

  4. D

    Intestinal mixing that brings contents into contact with the lining

08
Written response
1 point

Which stomach enzyme begins cutting proteins into smaller peptides?

09
Choose all
1 point

Which statements correctly describe how absorbed nutrients are transported? Select all that apply.

  1. A

    Sugars enter intestinal blood vessels and travel first to the liver.

  2. B

    Most dietary fats enter lymph vessels in chylomicrons.

  3. C

    Most dietary fats enter the hepatic portal vein inside chylomicrons.

  4. D

    Water-soluble vitamins generally enter the blood.

10
Choose one
1 point

A nutrient has reached the surface of the small intestine and must cross its lining to be absorbed. Which specialized cells form this crossing point?

  1. A

    Chylomicrons

  2. B

    Villi

  3. C

    Enterocytes

  4. D

    Electrolytes

11
True or false
1 point

True or false: Every fat-related molecule absorbed from the intestine must first travel through the lymphatic system.

  1. A

    True

  2. B

    False

12
Open ended
1 point

After a meal containing bread, eggs, and oil, explain how the absorbed products of carbohydrate and protein digestion differ from most absorbed dietary fat in their route to the rest of the body.

13
Choose one
1 point

Some carbohydrates resist human digestive enzymes and reach the large intestine. What can gut microbes do with some of them?

  1. A

    They turn all undigested carbohydrates into amino acids.

  2. B

    They ferment some undigested carbohydrates.

  3. C

    They produce bile to disperse fat.

  4. D

    They transport most dietary fat directly into portal blood.

14
Choose one
1 point

A meal contains protein. Which process begins its chemical digestion in the stomach?

  1. A

    It emulsifies proteins into droplets so enzymes can act on them.

  2. B

    It unfolds proteins with acid, while pepsin begins breaking them into smaller peptides.

  3. C

    It converts proteins directly into glucose before they enter the small intestine.

  4. D

    It packages proteins into chylomicrons for transport through lymph.

15
Choose one
1 point

A person chews a piece of bread before swallowing. Which event can begin the chemical digestion of its starch in the mouth?

  1. A

    Pepsin begins breaking starch into amino acids.

  2. B

    Bile begins breaking starch into simple sugars.

  3. C

    Salivary amylase begins breaking starch down.

  4. D

    Pancreatic lipase begins breaking starch into fatty acids.

16
Choose one
1 point

Acidic chyme leaves the stomach and enters the small intestine. What role does bicarbonate supplied by the pancreas play?

  1. A

    It helps neutralize acidic chyme entering the small intestine.

  2. B

    It emulsifies fat droplets in the stomach.

  3. C

    It carries absorbed sugars from the intestine to the liver.

  4. D

    It breaks starch into glucose in the mouth.

17
True or false
1 point

A water-soluble vitamin is absorbed from the small intestine. It generally enters blood rather than being packaged into a chylomicron.

  1. A

    True

  2. B

    False

18
Written response
1 point

Sugars and amino acids enter blood vessels in the intestinal villi. What is the name of the vessel that carries blood from the intestines first to the liver?

19
Written response
1 point

A nutrient crosses the intestinal lining through one of its specialized absorptive cells. What is the name of this cell type?

20
Fill in the blank
1 point

After most nutrient absorption has taken place in the small intestine, the colon reclaims much of the remaining from intestinal contents.