Question 1

Which of the following structural modifications of the small intestine is primarily responsible for increasing the surface area for nutrient absorption by providing permanent folds that force chyme to spiral through the lumen?

Accepted Answer

Circular folds

Question 2

A patient is experiencing severe diarrhea after chemotherapy. Which of the following best explains why chemotherapy often leads to gastrointestinal symptoms such as diarrhea?

Accepted Answer

Chemotherapy targets rapidly dividing GI tract epithelial cells, impairing absorption.

Question 3

Which of the following best describes the role of the brush border in the small intestine?

Accepted Answer

It contains membrane-bound enzymes for final carbohydrate and protein digestion.

Question 4

A patient with lactose intolerance consumes dairy products and develops diarrhea. Which physiological mechanism best explains this symptom?

Accepted Answer

Undigested lactose increases osmotic pressure in the intestine, preventing water absorption.

Question 5

Which of the following statements about the motility of the small intestine is correct?

Accepted Answer

Segmentation is most common after a meal and is initiated by intrinsic pacemaker cells.

Question 6

Which of the following best describes the absorption of fat-soluble vitamins (A, D, E, K) in the small intestine?

Accepted Answer

They are absorbed along with micelles and diffuse into absorptive cells.

Question 7

A patient has a blockage at the ileocecal valve. Which of the following is most likely to occur as a result?

Accepted Answer

Movement of chyme from the small intestine to the large intestine will be impaired.

Question 8

Which of the following is a unique feature of the large intestine not found elsewhere in the digestive tract?

Accepted Answer

Teniae coli

Question 9

A patient with a ruptured appendix is at high risk for which of the following complications?

Accepted Answer

Peritonitis due to the spread of infectious material into the abdominal cavity

Question 10

Which of the following best explains why the mucosa of the anal canal becomes stratified squamous epithelium?

Accepted Answer

To withstand abrasion during defecation

Question 11

Which of the following is the correct sequence for the subdivisions of the colon, starting from the cecum?

Accepted Answer

Ascending colon, transverse colon, descending colon, sigmoid colon

Question 12

Which of the following best describes the function of Peyer's patches in the small intestine?

Accepted Answer

They are aggregated lymphoid nodules that protect against microorganisms.

Question 13

Which of the following is true regarding the absorption of monosaccharides in the small intestine?

Accepted Answer

They are absorbed by secondary active transport with sodium ions.

Question 14

A patient with celiac disease has damage to the intestinal mucosa and brush border. Which of the following is most likely to occur?

Accepted Answer

Malabsorption of nutrients due to loss of surface area and enzyme activity

Question 15

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

Accepted Answer

It propels meal remnants, bacteria, and debris toward the large intestine via waves initiated by motilin.

Question 16

Which of the following is the primary function of the large intestine?

Accepted Answer

Absorption of water and electrolytes, and formation of feces

Question 17

Which of the following best explains why segmentation in the small intestine is important for digestion?

Accepted Answer

It mixes chyme with digestive juices and increases contact with absorptive surfaces.

Question 18

Which of the following statements about the blood supply to the small intestine is correct?

Accepted Answer

The superior mesenteric artery brings blood supply to the small intestine.

Question 19

Which of the following is a function of the intestinal crypts in the small intestine?

Accepted Answer

Production of intestinal juice, a watery mixture of mucus

Question 20

Which of the following best describes the role of the internal and external anal sphincters?

Accepted Answer

The internal sphincter is smooth muscle (involuntary), and the external sphincter is skeletal muscle (voluntary).

Study Notes: Anatomy & Physiology – The Digestive System (Small and Large Intestine)

Study Guide - Practice Questions

Study Guide - Flashcards