Question 1

Which section of the small intestine is primarily responsible for the absorption of vitamin B12 and bile salts?

Accepted Answer

Ileum

Question 2

What is the main function of bile salts in the duodenum during digestion?

Accepted Answer

Emulsify fats to increase surface area for lipase action

Question 3

Which enzyme is responsible for breaking down triglycerides into fatty acids and glycerol in the small intestine?

Accepted Answer

Lipase

Question 4

A patient with a damaged ileum may have difficulty absorbing which of the following?

Accepted Answer

Vitamin B12

Question 5

Which process describes the movement of food through the digestive tract via wave-like muscle contractions?

Accepted Answer

Peristalsis

Question 6

What is the correct sequence of events for the assimilation of glucose after absorption in the small intestine?

Accepted Answer

Glucose enters the bloodstream, is stored as glycogen in the liver, and is released as needed for energy

Question 7

Which formula represents the conversion of ammonia to urea in the liver during deamination?

Accepted Answer

$$\mathrm{NH_3$ + CO_2$ \rightarrow (NH_2$)_2CO + H_2O}$$

Question 8

Which structure in the small intestine increases surface area for absorption and contains capillaries and lacteals?

Accepted Answer

Villi

Question 9

If the colon fails to absorb sufficient water, what is the likely consequence?

Accepted Answer

Diarrhea

Question 10

Which of the following best describes the role of gut microbiota in the colon?

Accepted Answer

They break down undigested food substances and produce vitamins

Question 11

During fasting, which hormone triggers the conversion of glycogen back into glucose in the liver?

Accepted Answer

Glucagon

Question 12

Which layer of the colon is responsible for the absorption of water and electrolytes?

Accepted Answer

Mucosa

Question 13

A bolus is formed in the mouth and then moves down the esophagus. What is the next stage of digestion for the bolus?

Accepted Answer

It is converted to chyme in the stomach

Question 14

Which of the following is NOT a function of the liver in metabolism?

Accepted Answer

Production of digestive enzymes for the duodenum

Question 15

Which process describes the conversion of digested nutrient molecules into forms usable for energy, growth, and repair?

Accepted Answer

Assimilation

Question 16

Which of the following best explains why epithelial cells in the ileum contain numerous mitochondria?

Accepted Answer

To produce ATP for active transport of glucose and amino acids

Question 17

Which equation best represents the breakdown of glucose during cellular respiration?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + ATP}$$

Question 18

Which of the following is a direct product of protein digestion by trypsin in the duodenum?

Accepted Answer

Amino acids

Question 19

A patient with a deficiency in gut microbiota may experience which of the following symptoms?

Accepted Answer

Decreased production of vitamin K

Question 20

Which of the following best describes the role of segmentation in the ileum?

Accepted Answer

Mixes food to ensure maximum contact with villi for absorption

Structure and Function of the Intestines

Study Guide - Practice Questions