Question 1

Which of the following best describes the primary function of bile salts in the digestive process?

Accepted Answer

They emulsify fats, increasing the surface area for pancreatic lipase action.

Question 2

A population that relies almost exclusively on polished white rice as a staple food is at risk for which nutritional deficiency, and what is a potential solution?

Accepted Answer

Vitamin A deficiency; solution is to use genetically engineered golden rice.

Question 3

Which of the following is NOT a function of the liver in nutrient processing and homeostasis?

Accepted Answer

Secreting digestive enzymes directly into the stomach.

Question 4

Which hormone is released by the stomach in response to food and stimulates the secretion of gastric juices?

Accepted Answer

Gastrin

Question 5

What is the main role of the microbiome in the large intestine?

Accepted Answer

To synthesize certain vitamins and aid in the breakdown of unabsorbed organic material.

Question 6

Which of the following best explains why epithelial cells lining the stomach are not digested by gastric acid and pepsin?

Accepted Answer

They are replaced every three days and secrete a protective mucus layer.

Question 7

Which process is responsible for moving food through the esophagus to the stomach?

Accepted Answer

Peristalsis

Question 8

A patient is diagnosed with a stomach ulcer caused by Helicobacter pylori. What is the most effective treatment?

Accepted Answer

Antibiotics

Question 9

Which of the following nutrients is absorbed into the lymphatic system rather than directly into the bloodstream?

Accepted Answer

Chylomicrons (fats)

Question 10

Which hormone is secreted by the pancreas in response to high blood glucose and stimulates the uptake of glucose by cells?

Accepted Answer

Insulin

Question 11

Which of the following is a correct sequence of the four stages of food processing in animals?

Accepted Answer

Ingestion → Digestion → Absorption → Elimination

Question 12

Which of the following best describes an essential nutrient?

Accepted Answer

A nutrient that must be obtained from the diet because animal cells cannot synthesize it.

Question 13

Which of the following is a function of the hormone cholecystokinin (CCK) in digestion?

Accepted Answer

Increases the release of digestive enzymes from the pancreas and bile from the gallbladder.

Question 14

Which of the following best explains why cellulose is present in feces?

Accepted Answer

Cellulose is not digested by human enzymes and helps move food along the alimentary canal.

Question 15

Which of the following is a direct result of undernutrition?

Accepted Answer

The body breaks down its own proteins for fuel, leading to muscle loss and brain protein deficiency.

Question 16

Which of the following best describes the role of sphincters in the digestive system?

Accepted Answer

They regulate the passage of material between different compartments of the digestive tract.

Question 17

Which of the following molecules is digested in the oral cavity by salivary amylase?

Accepted Answer

Starch and glycogen

Question 18

Which hormone is secreted by adipose tissue and acts to suppress appetite?

Accepted Answer

Leptin

Question 19

Which of the following is a correct pathway for the absorption of amino acids from the small intestine to the heart?

Accepted Answer

Villi capillaries → hepatic portal vein → liver → heart

Question 20

Which of the following best describes the feedback mechanism involving secretin and CCK in the small intestine?

Accepted Answer

They inhibit peristalsis and gastric juice secretion in the stomach, allowing time for digestion in the small intestine.

Animal Nutrition: Structure, Function, and Regulation of the Digestive System

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