Question 1

Which of the following best describes the difference between mechanical and chemical digestion in the digestive tract?

Accepted Answer

Mechanical digestion uses muscular movements to physically break down food, while chemical digestion uses enzymes to break chemical bonds in food molecules.

Question 2

Which of the following lists the layers of the digestive tract from innermost to outermost?

Accepted Answer

Mucosa, submucosa, muscularis externa, serosa

Question 3

A patient has a blockage at the hepatopancreatic sphincter. Which of the following is the most likely consequence?

Accepted Answer

Bile will accumulate in the gall bladder, and pancreatic enzymes will not enter the duodenum.

Question 4

Which enzyme is present in saliva, and what is its primary function?

Accepted Answer

Amylase; digests carbohydrates

Question 5

Which of the following best describes the function of bile in digestion?

Accepted Answer

Bile emulsifies lipids, increasing their surface area for enzyme action.

Question 6

Which hormone stimulates the secretion of gastric acid by the stomach?

Accepted Answer

Gastrin

Question 7

A patient is unable to absorb fats efficiently. Which structure is most likely malfunctioning?

Accepted Answer

Villi of the small intestine

Question 8

Which of the following best describes the role of bicarbonate ions in pancreatic juice?

Accepted Answer

They neutralize acidic chyme entering the duodenum.

Question 9

Which of the following is a correct sequence of the digestive tract structures from mouth to anus?

Accepted Answer

Mouth, pharynx, esophagus, stomach, small intestine, large intestine, rectum, anus

Question 10

Which of the following best describes the difference between intraperitoneal and retroperitoneal organs?

Accepted Answer

Intraperitoneal organs are completely surrounded by the visceral peritoneum, while retroperitoneal organs are only partially covered.

Question 11

Which of the following is a function of the mesentery?

Accepted Answer

It anchors the intestines to the posterior abdominal wall and provides a pathway for blood vessels and nerves.

Question 12

During which phase of swallowing does the epiglottis cover the trachea to prevent aspiration?

Accepted Answer

Pharyngeal phase

Question 13

Which of the following enzymes is responsible for protein digestion in the stomach?

Accepted Answer

Pepsin

Question 14

Which hormone stimulates the gall bladder to contract and release bile into the small intestine?

Accepted Answer

Cholecystokinin (CCK)

Question 15

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

Accepted Answer

Impaired peristalsis and reduced propulsion of food

Question 16

Which of the following best describes the defecation reflex?

Accepted Answer

It is initiated by the stretching of the rectal wall, leading to relaxation of the internal anal sphincter.

Question 17

Which of the following statements about the regulation of digestion is correct?

Accepted Answer

Long reflexes involve the central nervous system, while short reflexes are mediated by local nerve plexuses.

Question 18

Which of the following pancreatic enzymes is responsible for digesting fats?

Accepted Answer

Pancreatic lipase

Question 19

A patient has a mutation that prevents the production of secretin. Which of the following is the most likely consequence?

Accepted Answer

Decreased bicarbonate secretion from the pancreas, leading to acidic chyme in the duodenum

Question 20

Which of the following best explains how carbohydrates are absorbed into the bloodstream after digestion?

Accepted Answer

Monosaccharides are absorbed by active transport into enterocytes and then enter capillaries in the villi.

Digestive System Anatomy & Physiology: Guided Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards