Increased surface area for enzymatic digestion

Denaturation by acid, activation of pepsinogen, enzymatic cleavage by pepsin

Desinfection of food by acidic gastric juice

Question 1

Which of the following is NOT a primary function of the stomach?

Accepted Answer

Enzymatic digestion of carbohydrates

Question 2

What is the role of intrinsic factor produced by the stomach?

Accepted Answer

It aids in the absorption of vitamin B12 in the small intestine.

Question 3

Which cell type in the gastric glands is responsible for secreting hydrochloric acid ($\mathrm{HCl}$)?

Accepted Answer

Parietal cell

Question 4

Pepsinogen is secreted by chief cells and is converted to pepsin in the presence of low pH. Which equation best represents this activation?

Accepted Answer

$\mathrm{Pepsinogen} + \mathrm{H^+} \rightarrow \mathrm{Pepsin}$

Question 5

Which process in the stomach is essential for the initial breakdown of protein structure?

Accepted Answer

Denaturation by acidic gastric juice

Question 6

A patient with autoimmune destruction of parietal cells is likely to develop which deficiency?

Accepted Answer

Vitamin B12 deficiency

Question 7

Which of the following best describes the formation of chyme in the stomach?

Accepted Answer

Food mixed with gastric juice

Question 8

Which hormone stimulates parietal cells to secrete hydrochloric acid ($\mathrm{HCl}$)?

Accepted Answer

Gastrin

Question 9

What is the main function of the mucous neck cells in the gastric glands?

Accepted Answer

Secretion of mucus to protect the stomach lining

Question 10

Which of the following best explains why proteins are denatured in the stomach?

Accepted Answer

The acidic environment disrupts hydrogen bonds and unfolds the protein structure.

Question 11

Which anatomical region of the stomach is primarily responsible for the storage of food?

Accepted Answer

Fundus

Question 12

A patient is unable to digest proteins efficiently due to a lack of pepsin. Which cell type is most likely malfunctioning?

Accepted Answer

Chief cell

Question 13

Which of the following is a direct consequence of the denaturation of proteins in the stomach?

Accepted Answer

Increased accessibility for enzymatic cleavage by pepsin

Question 14

Which of the following best describes the pH environment required for pepsin activation?

Accepted Answer

$\mathrm{pH} < 3$

Question 15

Which of the following is a result of mechanical breakup of food in the stomach?

Accepted Answer

Increased surface area for enzymatic digestion

Question 16

If the stomach fails to produce sufficient gastric juice, which of the following processes would be most directly impaired?

Accepted Answer

Formation of chyme

Question 17

Which of the following is the correct sequence of events for protein digestion in the stomach?

Accepted Answer

Denaturation by acid, activation of pepsinogen, enzymatic cleavage by pepsin

Question 18

Which of the following best describes the role of the stomach in the immune defense of the digestive tract?

Accepted Answer

Desinfection of food by acidic gastric juice

Question 19

Which of the following statements about the formation of chyme is correct?

Accepted Answer

Chyme is formed when gastric juice is mixed with ingested food in the stomach.

Question 20

Which of the following is a consequence of impaired production of intrinsic factor in the stomach?

Accepted Answer

Pernicious anemia due to vitamin B12 malabsorption

Human Biology/Histology: Structure and Function of the Stomach and Small Intestine

Study Guide - Practice Questions