Q: Which of the following equations best represents the chemical breakdown of starch by salivary amylase in the mouth?

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

Q: Which of the following is the correct dental formula for permanent human dentition?

$$2\text{Incisors}, 1\text{Canine}, 2\text{Premolars}, 3\text{Molars} ($$per quadrant)

Question 1

Which of the following best describes the function of the mucosa layer in the alimentary canal?

Accepted Answer

It secretes mucus, digestive enzymes, and hormones; absorbs end products of digestion; and protects against infectious disease.

Question 2

During swallowing, which structure rises to close off the nasopharynx, preventing food from entering the nasal cavity?

Accepted Answer

Uvula

Question 3

Which of the following is NOT considered an accessory digestive organ?

Accepted Answer

Stomach

Question 4

A patient presents with pernicious anemia. Which gastric secretion is most likely deficient?

Accepted Answer

Intrinsic factor

Question 5

Which process is primarily responsible for moving food through the esophagus?

Accepted Answer

Peristalsis

Question 6

Which of the following correctly matches the digestive process with its description?

Accepted Answer

Mechanical breakdown: increases surface area of food and prepares it for digestion by enzymes

Question 7

Which nerve plexus is primarily responsible for controlling GI tract motility?

Accepted Answer

Myenteric nerve plexus

Question 8

A patient has a blockage in the celiac trunk. Which organ is most likely to be affected?

Accepted Answer

Stomach

Question 9

Which of the following is a function of the enteric nervous system (gut brain)?

Accepted Answer

It regulates digestive activities independently of the central nervous system.

Question 10

Which of the following best explains why the stomach does not digest itself?

Accepted Answer

A mucosal barrier consisting of bicarbonate-rich mucus, tight junctions between epithelial cells, and rapid cell replacement protects the stomach lining.

Question 11

Which of the following equations best represents the chemical breakdown of starch by salivary amylase in the mouth?

Accepted Answer

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

Question 12

Which of the following is TRUE regarding the muscularis externa of the stomach?

Accepted Answer

It has an additional oblique layer that allows the stomach to churn and pummel food.

Question 13

Which hormone stimulates gastric secretion and motility?

Accepted Answer

Gastrin

Question 14

A patient is unable to absorb vitamin B$$_{12}$$ due to a lack of intrinsic factor. What is the most likely consequence?

Accepted Answer

Pernicious anemia

Question 15

Which of the following best describes the enterogastric reflex?

Accepted Answer

It inhibits gastric secretion and motility when the duodenum is stretched or chemically stimulated.

Question 16

Which of the following is the correct dental formula for permanent human dentition?

Accepted Answer

$$2	ext{Incisors}, 1	ext{Canine}, 2	ext{Premolars}, 3	ext{Molars} ($$per quadrant)

Question 17

Which of the following statements about saliva is CORRECT?

Accepted Answer

It contains enzymes such as amylase and lingual lipase, as well as proteins like mucin, lysozyme, and IgA.

Question 18

Which of the following best explains the role of tight junctions in the stomach epithelium?

Accepted Answer

They prevent gastric juice from leaking between epithelial cells, protecting underlying tissues.

Question 19

Which of the following is a correct sequence of events during the swallowing process?

Accepted Answer

Tongue forces bolus into oropharynx → Larynx rises, epiglottis blocks trachea → Upper esophageal sphincter contracts after food enters

Chapter 23: The Digestive System – Structure and Function

Guida di studio - Domande di pratica

Study guide - Flashcard