Question 1

Which of the following best describes the primary function of the small intestine in the digestive system?

Accepted Answer

Enzymatic digestion and absorption of nutrients

Question 2

A patient presents with chronic constipation, abdominal pain, and a dilated colon. Biopsy reveals a marked reduction in ganglion cells in the myenteric plexus of the rectum. Which condition is most likely?

Accepted Answer

Hirschsprung disease (congenital megacolon)

Question 3

Which of the following statements about smooth muscle in the digestive tract is correct?

Accepted Answer

Smooth muscle cells contract by twisting like a corkscrew

Question 4

During peristalsis, which sequence of muscle contractions propels a bolus through the digestive tract?

Accepted Answer

Circular muscles contract behind the bolus, longitudinal muscles contract ahead

Question 5

Which of the following is a function of the mesenteries in the digestive system?

Accepted Answer

Providing an access route for blood vessels, nerves, and lymphatics to the intestines

Question 6

A patient is unable to prevent air from entering the esophagus during swallowing. Which structure is most likely malfunctioning?

Accepted Answer

Upper esophageal sphincter

Question 7

Which of the following best explains why the oral mucosa is keratinized in some areas but not others?

Accepted Answer

Keratinization occurs only in areas exposed to severe abrasion, such as the superior tongue surface and hard palate

Question 8

Which of the following is NOT a function of the digestive tract?

Accepted Answer

Production of red blood cells

Question 9

Which neural plexus is primarily responsible for coordinating muscular contractions in the muscularis externa of the digestive tract?

Accepted Answer

Myenteric plexus

Question 10

A drug that blocks parasympathetic stimulation of the digestive tract would most likely cause which of the following effects?

Accepted Answer

Decreased digestive muscle tone and activity

Question 11

Which of the following best describes the difference between multi-unit and visceral smooth muscle cells?

Accepted Answer

Visceral smooth muscle cells contract in waves as a single unit, while multi-unit cells are individually innervated

Question 12

Which of the following is a correct sequence of the three phases of swallowing (deglutition)?

Accepted Answer

Buccal phase, pharyngeal phase, esophageal phase

Question 13

Which of the following best explains the importance of villi in the small intestine?

Accepted Answer

They increase the surface area for absorption of nutrients

Question 14

A patient with a deficiency in enteroendocrine cell function would most likely have problems with which aspect of digestion?

Accepted Answer

Hormonal regulation of digestive activities

Question 15

Which of the following equations best represents the relationship between surface area ($$A$$), length ($$L$$), and radius ($$r) of a $$cylindrical digestive tract segment, assuming it is a perfect cylinder?

Accepted Answer

$$A = 2 \pi r L$$

Question 16

Which of the following is a primary effect of segmentation in the small intestine?

Accepted Answer

Mixing intestinal contents with digestive secretions

Question 17

Which of the following best describes the role of the lamina propria in the mucosa of the digestive tract?

Accepted Answer

It is areolar tissue containing blood vessels, nerves, and lymphatics

Question 18

Which of the following best explains why tension development and resting length are not directly related in smooth muscle of the digestive tract?

Accepted Answer

The scattered arrangement of thick and thin filaments allows for elasticity over a wide range of lengths

Question 19

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

Accepted Answer

Long reflexes involve the CNS and generally control large-scale peristalsis

Question 20

A patient is found to have a non-functioning lower esophageal sphincter. Which of the following symptoms is most likely to occur?

Accepted Answer

Backflow of stomach contents into the esophagus (acid reflux)

The Digestive System: Structure, Function, and Integration

Guida di studio - Domande di pratica

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