Question 1

Which of the following best describes the primary function of the gastrointestinal (GI) system?

Accepted Answer

To digest food and absorb nutrients, salts, and water into the body's internal environment

Question 2

Which process involves the movement of nutrients, salts, and water from the GI tract into the blood or lymph?

Accepted Answer

Absorption

Question 3

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

Accepted Answer

Large intestine

Question 4

The process of breaking down food into molecular components that can be absorbed is called:

Accepted Answer

Digestion

Question 5

Which of the following best describes the role of gut-associated lymphoid tissue (GALT) in the digestive system?

Accepted Answer

It provides immune protection against ingested pathogens

Question 6

Which phase of digestion is primarily triggered by the sight, smell, or thought of food?

Accepted Answer

Cephalic phase

Question 7

Which of the following equations best represents the movement of water from the GI lumen to the extracellular fluid (ECF)?

Accepted Answer

$$Water_{GI\ lumen} \rightarrow Water_{ECF}$$

Question 8

Which of the following is a correct sequence of the four basic digestive processes?

Accepted Answer

Motility, Secretion, Digestion, Absorption

Question 9

A patient presents with chronic diarrhea and vomiting. Which protective response of the GI system is most likely being activated?

Accepted Answer

Protective responses to eliminate pathogens

Question 10

Which of the following best explains why the digestive system is considered the largest immune organ in the body?

Accepted Answer

It contains extensive gut-associated lymphoid tissue (GALT) that protects against pathogens

Question 11

Which of the following is a function of the enteric nervous system in GI physiology?

Accepted Answer

Control of motility and secretion within the GI tract

Question 12

Which of the following microorganisms is commonly found in the human intestine and is sometimes associated with disease?

Accepted Answer

Escherichia coli

Question 13

Which equation best represents the absorption of glucose from the GI lumen into the blood?

Accepted Answer

$$Glucose_{GI\ lumen} \rightarrow Glucose_{Blood}$$

Question 14

Which of the following is a real-world consequence of impaired GI motility?

Accepted Answer

Decreased absorption of nutrients leading to malnutrition

Question 15

Which hormone or neurotransmitter is most likely to increase GI motility?

Accepted Answer

Acetylcholine

Question 16

A patient with a deficiency in stomach acid is at increased risk for which of the following?

Accepted Answer

Impaired protein digestion and increased susceptibility to pathogens

Question 17

Which of the following best describes the role of smooth muscle in the GI tract?

Accepted Answer

It enables peristalsis and segmentation for movement and mixing of food

Question 18

Which of the following is a plausible outcome if the gut-associated lymphoid tissue (GALT) is compromised?

Accepted Answer

Increased risk of GI infections

Question 19

Which equation best represents the secretion of digestive enzymes from cells into the GI lumen?

Accepted Answer

$$Enzymes_{Cells} \rightarrow Enzymes_{GI\ lumen}$$

Question 20

Which of the following is a major theme in the history of gastrointestinal physiology?

Accepted Answer

The use of enemas for cleansing and disease prevention

Gastrointestinal (GI) Physiology: Overview and Historical Context

Study Guide - Practice Questions