Question 1

Which layer of the esophagus is responsible for producing mucus to aid in the movement of the food bolus, and what type of tissue primarily composes this layer?

Accepted Answer

Submucosa; areolar connective tissue

Question 2

During swallowing, which phase is voluntary and involves the tongue pressing the bolus against the hard palate?

Accepted Answer

Buccal phase

Question 3

What is the primary function of the gastroesophageal (cardiac) sphincter?

Accepted Answer

To prevent acid reflux by keeping the orifice closed when food is not being swallowed

Question 4

Which of the following best describes the change in epithelial tissue at the esophagus-stomach junction?

Accepted Answer

Stratified squamous epithelium changes to simple columnar epithelium

Question 5

A patient presents with heartburn after eating large meals and reports a burning sensation in the chest. Which anatomical structure is most likely malfunctioning?

Accepted Answer

Gastroesophageal (cardiac) sphincter

Question 6

Which of the following is NOT a function of the stomach’s muscularis externa?

Accepted Answer

Absorbing nutrients into the bloodstream

Question 7

Which cell type in the gastric gland secretes hydrochloric acid and intrinsic factor?

Accepted Answer

Parietal cell

Question 8

What is the main consequence of a lack of intrinsic factor secretion in the stomach?

Accepted Answer

Pernicious anemia due to impaired vitamin B12 absorption

Question 9

Which of the following best explains the 'alkaline tide' that occurs after a meal?

Accepted Answer

Increased secretion of HCO$$_3^-$$ into the blood as H$$^+ is $$pumped into the stomach lumen

Question 10

Which hormone is released by enteroendocrine cells in response to partially digested proteins and stimulates HCl secretion by parietal cells?

Accepted Answer

Gastrin

Question 11

A patient with a Helicobacter pylori infection is at increased risk for which of the following conditions?

Accepted Answer

Gastric ulcers

Question 12

Which of the following events occurs during the pharyngeal-esophageal phase of swallowing?

Accepted Answer

The upper esophageal sphincter relaxes, allowing food to enter the esophagus

Question 13

Which of the following is a key protective feature of the stomach’s mucosal barrier?

Accepted Answer

A thick layer of bicarbonate-rich mucus

Question 14

Which of the following best describes the sequence of muscle activity during peristalsis in the esophagus?

Accepted Answer

Circular muscles contract behind the bolus while longitudinal muscles contract ahead of it

Question 15

Which of the following is a direct result of the enterogastric reflex?

Accepted Answer

Inhibition of gastric secretion and motility

Question 16

Which of the following best explains why carbohydrate-rich chyme moves more quickly through the duodenum than fatty chyme?

Accepted Answer

Fatty chyme stimulates the release of enterogastrones that slow gastric emptying

Question 17

Which of the following is the only stomach function essential to life?

Accepted Answer

Secretion of intrinsic factor for vitamin B$$_{12}$$ absorption

Question 18

Which of the following best describes the role of chief cells in the gastric gland?

Accepted Answer

Secrete pepsinogen and gastric lipase

Question 19

Which of the following is a plausible consequence of excessive vomiting?

Accepted Answer

Metabolic alkalosis due to loss of stomach acid

Question 20

Which of the following best describes the function of the oblique muscle layer in the stomach?

Accepted Answer

It allows the stomach to churn, mix, and pummel food more efficiently

Digestive System: Pharynx, Esophagus, Stomach, and Accessory Organs

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