Question 1

Which of the following best describes the function of the muscularis externa in the alimentary canal?

Accepted Answer

It is responsible for segmentation and peristalsis, facilitating movement and mixing of food.

Question 2

A patient presents with difficulty swallowing and food passage through the esophagus. Which process is most likely impaired?

Accepted Answer

Peristalsis

Question 3

Which layer of the alimentary canal contains the submucosal nerve plexus and is rich in elastic tissue to help organs regain shape after storing a large meal?

Accepted Answer

Submucosa

Question 4

Which of the following is a function of the mucosa layer in the digestive tract?

Accepted Answer

It absorbs end products of digestion and protects against infectious disease.

Question 5

A patient with dry mouth (xerostomia) is likely experiencing inhibition of which nervous system division?

Accepted Answer

Sympathetic nervous system

Question 6

Which of the following correctly matches the digestive process with its description?

Accepted Answer

Mechanical breakdown: includes chewing, mixing food with saliva, and churning in the stomach

Question 7

Which of the following glands produces mostly serous secretions containing enzymes and ions?

Accepted Answer

Parotid gland

Question 8

Which equation best represents the neutralization of stomach acid by pancreatic secretions in the small intestine?

Accepted Answer

$\mathrm{HCl} + \mathrm{NaHCO_3} \rightarrow \mathrm{NaCl} + \mathrm{H_2O} + \mathrm{CO_2}$

Question 9

Which of the following is NOT a function of saliva?

Accepted Answer

Absorbs nutrients into the bloodstream

Question 10

Which of the following statements about the enteric nervous system is TRUE?

Accepted Answer

It contains more neurons than the spinal cord and controls GI tract motility.

Question 11

A patient has a blockage in the myenteric nerve plexus. Which digestive function is most likely to be affected?

Accepted Answer

Control of GI tract motility, including peristalsis and segmentation

Question 12

Which of the following organs is considered retroperitoneal?

Accepted Answer

Duodenum

Question 13

Which of the following best describes segmentation in the small intestine?

Accepted Answer

Local constriction of the intestine that mixes food with digestive juices

Question 14

Which of the following is a correct sequence of layers from the lumen outward in the alimentary canal?

Accepted Answer

Mucosa, submucosa, muscularis externa, serosa

Question 15

Which of the following is a function of the lamina propria in the mucosa?

Accepted Answer

Provides nourishment and absorption via its rich supply of capillaries

Question 16

Which of the following best explains the role of the parasympathetic nervous system in digestion?

Accepted Answer

It enhances digestive processes by stimulating secretion and motility.

Question 17

Which of the following is a correct description of the peritoneum?

Accepted Answer

A serous membrane of the abdominal cavity consisting of visceral and parietal layers

Question 18

Which of the following is a major function of the accessory digestive organs?

Accepted Answer

Producing secretions that help break down foodstuffs

Question 19

Which of the following best describes the role of the submucosal nerve plexus?

Accepted Answer

Regulates glands and smooth muscle in the mucosa

Question 20

Which of the following is a correct statement about the hormonal regulation of digestive activity?

Accepted Answer

Hormones from cells in the stomach and small intestine stimulate target cells in the same or different organs to secrete or contract.

Digestive System: Structure, Function, and Processes (Anatomy & Physiology Study Notes)

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