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

$$\text{Starch} \xrightarrow{\text{amylase}} \text{Maltose}$$

Question 1

Which structure in the respiratory system is primarily responsible for gas exchange between air and blood?

Accepted Answer

Alveoli

Question 2

A patient is experiencing difficulty in swallowing and has a hoarse voice. Which respiratory structure is most likely affected?

Accepted Answer

Larynx

Question 3

Which equation best represents the process of cellular respiration that occurs in body tissues?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + 6\mathrm{O_2$} ightarrow 6\mathrm{CO_2$} + 6\mathrm{H_2O} + 	ext{energy}$$

Question 4

Which of the following best describes the function of the tracheal cartilages?

Accepted Answer

They prevent the trachea from collapsing and maintain an open airway.

Question 5

During digestion, which organ is primarily responsible for the absorption of nutrients into the bloodstream?

Accepted Answer

Small intestine

Question 6

A patient has a blockage in the common bile duct. Which digestive process will be most affected?

Accepted Answer

Fat emulsification in the small intestine

Question 7

Which of the following is a function of the large intestine?

Accepted Answer

Absorption of water and formation of feces

Question 8

Which equation represents the conversion of starch to maltose by salivary amylase?

Accepted Answer

$$	ext{Starch} \xrightarrow{	ext{amylase}} 	ext{Maltose}$$

Question 9

Which of the following best explains the role of the distal convoluted tubule (DCT) in the urinary system?

Accepted Answer

It actively secretes ions, acids, and other substances into the tubular fluid.

Question 10

A patient is unable to reabsorb sodium ions efficiently in the nephron. Which part of the nephron is most likely malfunctioning?

Accepted Answer

Distal convoluted tubule (DCT)

Question 11

Which of the following structures prevents food from entering the trachea during swallowing?

Accepted Answer

Epiglottis

Question 12

Which process in the digestive system is most directly responsible for the breakdown of fats?

Accepted Answer

Emulsification by bile

Question 13

If the mucous membrane lining the stomach is damaged, which of the following is most likely to occur?

Accepted Answer

Increased risk of ulcers due to acid damage

Question 14

Which of the following best describes the function of the respiratory system?

Accepted Answer

Exchanging oxygen and carbon dioxide between the blood and the environment

Question 15

A patient presents with dehydration and very concentrated urine. Which part of the nephron is most likely increasing water reabsorption?

Accepted Answer

Loop of Henle

Question 16

Which of the following is NOT a function of the digestive system?

Accepted Answer

Production of urine

Question 17

Which structure in the urinary system collects urine from the renal pyramids before it enters the ureter?

Accepted Answer

Minor calyx

Question 18

Which of the following best describes the role of the mucous membrane in the digestive tract?

Accepted Answer

It protects underlying tissues from digestive enzymes and acids.

Question 19

Which of the following is a correct sequence of airflow during inhalation?

Accepted Answer

Nasal cavity → Larynx → Trachea → Bronchi → Alveoli

Question 20

A patient with chronic bronchitis has inflammation and narrowing of which respiratory structure?

Accepted Answer

Bronchi

Study Guide: Respiratory, Digestive, and Urinary Systems

Study Guide - Practice Questions