Question 1

Which layer of the esophagus is responsible for secreting mucus to aid in the movement of the food bolus?

Accepted Answer

Esophageal glands in the submucosa

Question 2

What type of epithelium lines the esophageal mucosa, and what does it change to at the stomach?

Accepted Answer

Stratified squamous; changes to simple columnar at the stomach

Question 3

Which muscle type is found in the superior portion of the esophagus?

Accepted Answer

Skeletal muscle

Question 4

The esophagus is collapsed when not involved in food propulsion. What anatomical feature allows it to expand during swallowing?

Accepted Answer

Elastic connective tissue in the submucosa

Question 5

Which sphincter prevents acid reflux from the stomach into the esophagus?

Accepted Answer

Gastroesophageal (cardiac) sphincter

Question 6

During swallowing, which phase is voluntary and involves the contraction of the tongue?

Accepted Answer

Buccal phase

Question 7

Which nerve primarily controls the involuntary phase of swallowing?

Accepted Answer

Vagus nerve

Question 8

A patient presents with heartburn after running and eating a large meal. Which anatomical abnormality could be responsible for this symptom?

Accepted Answer

Hiatal hernia

Question 9

Which of the following is NOT a function of the pharynx?

Accepted Answer

Initiates chemical digestion

Question 10

If the esophageal mucosa is damaged and replaced by simple columnar epithelium, what condition might this indicate?

Accepted Answer

Barrett's esophagus

Question 11

Which of the following best describes the arrangement of muscle layers in the pharynx?

Accepted Answer

Inner longitudinal, outer pharyngeal constrictors

Question 12

Which histological feature distinguishes the esophagus from the stomach?

Accepted Answer

Presence of adventitia instead of serosa

Question 13

A patient with chronic acid reflux is at risk for which serious complication?

Accepted Answer

Esophageal cancer

Question 14

Which equation best represents the pressure-volume relationship in the esophagus during swallowing?

Accepted Answer

$$P = \frac{F}{A}$$

Question 15

Which of the following is a function of mucus-producing glands in the pharynx and esophagus?

Accepted Answer

Protect against mechanical and chemical injury

Question 16

Which anatomical structure does the esophagus pass through to reach the stomach?

Accepted Answer

Esophageal hiatus of the diaphragm

Question 17

Which of the following best explains why the esophagus has both skeletal and smooth muscle in its muscularis externa?

Accepted Answer

To allow voluntary control of swallowing initially and involuntary propulsion later

Question 18

Which process involves the coordination of 22 muscle groups and is essential for moving food from the mouth to the stomach?

Accepted Answer

Deglutition (swallowing)

Question 19

Which of the following is a consequence of a hiatal hernia?

Accepted Answer

Part of the stomach protrudes above the diaphragm, increasing risk of acid reflux

Question 20

Which of the following best describes the function of the outer pharyngeal constrictors?

Accepted Answer

Encircle the wall of the pharynx to propel food downward

Digestive System: Anatomy and Physiology of the Pharynx and Esophagus 2

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