Question 1

Which of the following best describes the main function of the alimentary canal in the digestive system?

Accepted Answer

It forms a continuous muscular tube that digests and absorbs food.

Question 2

A patient presents with a gastric ulcer. Which phase of digestive regulation is most directly involved in the initial stimulation of gastric secretions?

Accepted Answer

Cephalic phase

Question 3

Which layer of the alimentary canal is primarily responsible for peristalsis and segmentation?

Accepted Answer

Muscularis externa

Question 4

The enteric nervous system is sometimes called the 'gut brain.' Which of the following best describes its function?

Accepted Answer

It regulates local digestive activity independently of the central nervous system.

Question 5

Which hormone stimulates the contraction of the gallbladder and the release of bile into the small intestine?

Accepted Answer

Cholecystokinin (CCK)

Question 6

During the digestion of carbohydrates, which enzyme is responsible for breaking down starch into maltose in the small intestine?

Accepted Answer

Pancreatic amylase

Question 7

Which of the following best explains why fat-soluble vitamins (A, D, E, K) are absorbed differently than water-soluble vitamins?

Accepted Answer

They are incorporated into micelles and absorbed with dietary fats into lacteals.

Question 8

A patient with chronic pancreatitis has difficulty digesting fats. Which of the following best explains this symptom?

Accepted Answer

Reduced secretion of pancreatic lipase

Question 9

Which of the following equations correctly represents the overall process of cellular respiration?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + ATP}$$

Question 10

Which of the following best describes the process of absorption in the small intestine?

Accepted Answer

Movement of nutrients from the lumen of the gut into the body

Question 11

A patient is unable to absorb vitamin B12 due to a lack of intrinsic factor. Which part of the digestive tract is most likely affected?

Accepted Answer

Stomach

Question 12

Which of the following is a correct sequence of events in the processing of food by the digestive system?

Accepted Answer

Ingestion → Propulsion → Mechanical breakdown → Digestion → Absorption → Defecation

Question 13

Which of the following best explains why sodium (Na⁺) absorption in the small intestine is important for water absorption?

Accepted Answer

Sodium absorption increases the osmotic gradient, causing water to follow by osmosis.

Question 14

A patient with a damaged myenteric nerve plexus would most likely experience which of the following symptoms?

Accepted Answer

Impaired muscular contractions and motility in the gut

Question 15

Which of the following best describes the role of hydrolysis in digestion?

Accepted Answer

It adds water to break chemical bonds in macromolecules.

Question 16

Which of the following is a primary function of the pancreas in digestion?

Accepted Answer

Production of digestive enzymes that are activated by CCK and secretin

Question 17

A patient with malabsorption syndrome is found to have fatty stools (steatorrhea). Which of the following is the most likely cause?

Accepted Answer

Deficiency of pancreatic enzymes or bile salts

Question 18

Which of the following best describes the main goal of metabolism in the human body?

Accepted Answer

To generate ATP for cellular work

Question 19

Which of the following statements about the defecation reflex is correct?

Accepted Answer

It involves both spinal and parasympathetic nervous system control.

Question 20

A patient is unable to digest proteins efficiently. Which of the following is most likely deficient?

Accepted Answer

Pepsin

Digestive System and Metabolism: Study Guide for Anatomy & Physiology

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