Q: Which equation best represents the conversion of pepsinogen to pepsin in the stomach?

$$ \text{Pepsinogen} + \text{HCl} \rightarrow \text{Pepsin} $$

Q: Which equation best represents the process of emulsification of lipids by bile salts?

$$ \text{Lipids} + \text{Bile Salts} \rightarrow \text{Emulsified Lipid Droplets} $$

Q: Which equation best represents the breakdown of starch by salivary amylase?

$$ \text{Starch} + \text{Salivary Amylase} \rightarrow \text{Maltose} $$

Q: Which equation best represents the absorption of glucose in the small intestine?

$$ \text{Glucose}_{\text{lumen}} \rightarrow \text{Glucose}_{\text{capillary}} $$

Q: Which equation best represents the breakdown of proteins by pepsin in the stomach?

$$ \text{Proteins} + \text{Pepsin} \rightarrow \text{Peptides} $$

Question 1

Which layer of the digestive tract is primarily responsible for rhythmic contractions that propel food forward, and which neural plexus controls these contractions?

Accepted Answer

Muscular layer; myenteric plexus

Question 2

A patient presents with anemia due to vitamin B12 deficiency. Which gastric cell is most likely dysfunctional, and what is its primary secretion?

Accepted Answer

Parietal cell; intrinsic factor

Question 3

During the cephalic phase of gastric regulation, which system initiates the preparation of the stomach for food intake?

Accepted Answer

Central nervous system

Question 4

Which hormone is released when chyme arrives in the duodenum and stimulates the ejection of bile from the gallbladder?

Accepted Answer

Cholecystokinin (CCK)

Question 5

What is the primary function of brush border enzymes in the small intestine?

Accepted Answer

Break down materials that come into contact with the border for absorption

Question 6

If the lower esophageal sphincter fails to function properly, which condition is most likely to occur?

Accepted Answer

Gastroesophageal reflux

Question 7

Which equation best represents the conversion of pepsinogen to pepsin in the stomach?

Accepted Answer

$$ 	ext{Pepsinogen} + 	ext{HCl} ightarrow 	ext{Pepsin} $$

Question 8

Which structure in the small intestine increases surface area for absorption and contains a capillary network and lacteal?

Accepted Answer

Villi

Question 9

A patient with excessive acid production in the stomach is at risk for which condition?

Accepted Answer

Ulcer

Question 10

Which phase of swallowing is voluntary and involves the movement of the bolus into the pharynx?

Accepted Answer

Buccal phase

Question 11

Which two plexuses make up the enteric nervous system?

Accepted Answer

Submucosal and myenteric plexuses

Question 12

Which division of the autonomic nervous system activates digestion aside from the enteric nervous system?

Accepted Answer

Parasympathetic division

Question 13

Why does the liver have dual circulation?

Accepted Answer

To supply oxygen and process nutrients from the digestive tract

Question 14

Which equation best represents the process of emulsification of lipids by bile salts?

Accepted Answer

$$ 	ext{Lipids} + 	ext{Bile Salts} ightarrow 	ext{Emulsified Lipid Droplets} $$

Question 15

Which organ is responsible for the bulk of chemical digestion and nutrient absorption?

Accepted Answer

Jejunum

Question 16

Which equation best represents the breakdown of starch by salivary amylase?

Accepted Answer

$$ 	ext{Starch} + 	ext{Salivary Amylase} ightarrow 	ext{Maltose} $$

Question 17

Which structure prevents the backflow of food from the stomach into the esophagus?

Accepted Answer

Lower esophageal sphincter

Question 18

Which equation best represents the absorption of glucose in the small intestine?

Accepted Answer

$$ 	ext{Glucose}_{	ext{lumen}} ightarrow 	ext{Glucose}_{	ext{capillary}} $$

Question 19

Which process is primarily responsible for the movement of feces into the rectum, triggering the defecation reflex?

Accepted Answer

Peristalsis

Question 20

Which equation best represents the breakdown of proteins by pepsin in the stomach?

Accepted Answer

$$ 	ext{Proteins} + 	ext{Pepsin} ightarrow 	ext{Peptides} $$

The Digestive System: Functional Anatomy, Physiology, and Regulation

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