Question 1

Which of the following best describes the primary function of the digestive system?

Accepted Answer

To provide nutrients for cell maintenance and growth

Question 2

Which layer of the digestive tract is responsible for peristalsis and segmentation?

Accepted Answer

Muscularis externa

Question 3

A patient has a disorder affecting the mesenteries. Which of the following consequences is most likely?

Accepted Answer

Reduced blood supply and stabilization of the intestines

Question 4

Which of the following equations correctly represents the relationship between surface area ($$A) $$and absorption rate ($$R) in $$the digestive tract?

Accepted Answer

$$R = k 	imes A$$

Question 5

Which of the following statements about the mucosa of the digestive tract is correct?

Accepted Answer

It contains glands and lymphatic tissue for immune defense

Question 6

During peristalsis, which sequence of muscle contraction occurs?

Accepted Answer

Circular muscles contract behind the bolus, longitudinal muscles contract ahead of the bolus

Question 7

Which nerve plexus is located in the submucosal layer and regulates glandular secretions?

Accepted Answer

Submucosal plexus

Question 8

A patient with impaired segmentation in the small intestine would most likely experience which of the following?

Accepted Answer

Reduced mixing of chyme and digestive secretions

Question 9

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

Accepted Answer

It is the outermost layer that reduces friction between digestive organs and surrounding structures

Question 10

Which of the following best explains why smooth muscle in the digestive tract can contract over a wide range of lengths?

Accepted Answer

The arrangement of actin and myosin filaments allows for plasticity in contraction

Question 11

Which of the following is a function of local regulatory factors in the digestive tract?

Accepted Answer

They coordinate responses to changes in pH or physical distortion of the wall

Question 12

Which of the following is true regarding multi-unit smooth muscle cells in the digestive tract?

Accepted Answer

Each cell may be connected to more than one motor neuron

Question 13

Which equation best represents the relationship between frequency of peristaltic contractions ($$f$$), speed of bolus movement ($$v$$), and distance traveled ($$d) in $$the digestive tract?

Accepted Answer

$$d = v 	imes t$$

Question 14

Which of the following is a characteristic of visceral smooth muscle cells?

Accepted Answer

They contract as a single unit due to gap junctions

Question 15

Which of the following best describes segmentation in the digestive tract?

Accepted Answer

A cycle of contraction that mixes chyme and digestive secretions

Question 16

Which of the following hormones is most likely to be secreted by enteroendocrine cells in the digestive tract to regulate digestive function?

Accepted Answer

Gastrin

Question 17

A patient presents with impaired function of the myenteric plexus. Which symptom would you most expect?

Accepted Answer

Reduced motility of the digestive tract

Question 18

Which of the following is NOT a function of the accessory organs of the digestive system?

Accepted Answer

Absorption of nutrients into the bloodstream

Question 19

Which of the following best explains why the digestive system works closely with the cardiovascular system?

Accepted Answer

To transport absorbed nutrients to cells throughout the body

Question 20

Which of the following is a correct sequence of layers from the lumen outward in the digestive tract?

Accepted Answer

Mucosa, submucosa, muscularis externa, serosa

Chapter 22: The Digestive System – Structure and Function

Guida di studio - Domande di pratica

Study guide - Flashcard