Question 1

Which of the following best describes the primary function of the muscularis externa in the digestive tract?

Accepted Answer

Performs segmentation and peristalsis to propel and mix food

Question 2

A patient presents with heartburn after eating large meals. Which anatomical structure is most likely malfunctioning to cause this symptom?

Accepted Answer

Lower esophageal sphincter

Question 3

Which layer of the digestive tract contains the mucosa-associated lymphatic tissue (MALT) and is responsible for secretion, absorption, and protection?

Accepted Answer

Mucosa

Question 4

Which enzyme is responsible for the initial chemical digestion of starch in the mouth, and what is its optimal pH?

Accepted Answer

Salivary amylase; neutral

Question 5

A newborn is diagnosed with ankyloglossia. Which structure is abnormally short, and what is a likely consequence?

Accepted Answer

Lingual frenulum; difficulty with speech and breastfeeding

Question 6

Which of the following is NOT a function of saliva?

Accepted Answer

Absorbs nutrients into the bloodstream

Question 7

Which of the following best explains why the esophagus has an adventitia instead of a serosa?

Accepted Answer

It is located outside the abdominopelvic cavity and needs to bind to surrounding structures

Question 8

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

Accepted Answer

It coordinates muscle activity and regulates secretions independently of the CNS

Question 9

Which of the following is a correct sequence of the layers of the GI tract from innermost to outermost?

Accepted Answer

Mucosa, submucosa, muscularis externa, serosa

Question 10

A patient with a hiatal hernia is at increased risk for which condition, and why?

Accepted Answer

GERD; because part of the stomach protrudes above the diaphragm, weakening the lower esophageal sphincter

Question 11

Which of the following best describes the role of the greater omentum?

Accepted Answer

It is a fatty blanket that hangs in front of the intestines and stores adipose tissue

Question 12

Which of the following nutrients does NOT require enzymatic breakdown before absorption?

Accepted Answer

Vitamins

Question 13

Which of the following is a function of the submucosa in the digestive tract?

Accepted Answer

Contains blood and lymphatic vessels, lymphoid follicles, and nerve fibers

Question 14

Which of the following best describes peristalsis?

Accepted Answer

Alternating waves of contraction and relaxation that propel food through the digestive tract

Question 15

A patient has difficulty swallowing and food often gets stuck in the pharynx. Which muscle group is most likely impaired?

Accepted Answer

Pharyngeal constrictors

Question 16

Which of the following is TRUE regarding the absorption of nutrients in the digestive system?

Accepted Answer

Absorption involves the passage of digested end products from the lumen through mucosal cells into blood or lymph

Question 17

Which of the following is a correct pairing of digestive enzyme and its substrate?

Accepted Answer

Lipase – fats

Question 18

Which of the following best explains the function of the mesenteries?

Accepted Answer

They hold the intestines in place, prevent twisting, and provide a passage for blood vessels and nerves

Question 19

Which of the following is a plausible consequence of a malfunctioning enteric nervous system?

Accepted Answer

Impaired coordination of muscle contractions and abnormal GI secretions

Question 20

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

Accepted Answer

Mechanical digestion involves physical breakdown of food, while chemical digestion involves enzymatic breakdown into smaller molecules

The Digestive System: Structure, Function, and Clinical Relevance

Guida di studio - Domande di pratica

Study guide - Flashcard