01
True or false
1 point
In much of the conducting tract, cilia help move mucus and trapped particles toward the throat. True or false?
Free Practice Quiz Question List
7 The Respiratory System Online Quiz Questions
Use this free practice quiz with 20 questions to review 7 The Respiratory System, test your knowledge, and prepare for your next test or exam.
20 questions
02
Choose one
1 point
As the chest wall moves during breathing, what is the role of the small amount of fluid between the pleural membranes?
- A
It carries oxygen from the lungs directly to the heart.
- B
It reduces friction and helps the lungs follow chest-wall movements.
- C
It prevents air from entering the alveoli.
- D
It moves mucus from the bronchioles toward the throat.
03
Written response
1 point
When gases diffuse across a respiratory membrane, each moves down its own gradient. What is the term for the pressure contributed by one gas in a mixture?
04
Fill in the blank
1 point
During quiet inhalation, the diaphragm and moves downward, helping expand the chest cavity.
05
True or false
1 point
During quiet exhalation, the diaphragm and external intercostal muscles relax, and elastic recoil raises pressure inside the lungs. True or false?
- A
True
- B
False
06
Choose one
1 point
Oxygen leaves the blood and enters body cells, while carbon dioxide produced by those cells enters the blood. What is this exchange called?
- A
Pulmonary ventilation
- B
External respiration
- C
Internal respiration
- D
Pulmonary perfusion
07
Written response
1 point
Most oxygen in the blood is carried reversibly bound to which protein in red blood cells?
08
Fill in the blank
1 point
The respiratory zone begins with the .
09
Choose one
1 point
Which description best explains how the respiratory membrane separates alveolar air from blood?
- A
It consists of the pleural membranes and the chest wall.
- B
It is formed by alveolar and capillary walls.
- C
It transports gases by carrying them inside bronchioles.
- D
It prevents gases from diffusing between air and blood.
10
Choose all
1 point
Select all statements that accurately describe how carbon dioxide is transported in blood.
- A
Most carbon dioxide is transported as bicarbonate ions in plasma.
- B
Some carbon dioxide is bound to hemoglobin.
- C
Most carbon dioxide is carried bound to hemoglobin.
- D
Some carbon dioxide is dissolved in plasma.
11
Choose all
1 point
Select all conditions in active tissues that encourage hemoglobin to release oxygen.
- A
Higher carbon dioxide levels in active tissues
- B
Lower carbon dioxide levels in active tissues
- C
Greater acidity in active tissues
- D
Lower acidity in active tissues
12
Choose one
1 point
An alveolus receives little fresh air, but blood continues to flow through nearby capillaries. What is the most likely result?
- A
Exchange remains fully effective because adequate blood flow is sufficient on its own.
- B
Exchange is limited because little fresh air reaches the alveolus.
- C
Exchange stops because blood flow prevents air from entering the alveolus.
- D
Exchange increases because reduced ventilation raises the supply of oxygen.
13
Open ended
1 point
An alveolus receives little fresh air while blood flow through its nearby capillaries remains adequate. Explain why gas exchange is still limited and state the usual directions in which oxygen and carbon dioxide diffuse between alveolar air and blood.
14
Choose one
1 point
During exercise, which breathing response helps supply alveoli with more fresh air and remove more carbon dioxide?
- A
It slows and becomes shallower, reducing the movement of air.
- B
It becomes faster and deeper, increasing ventilation.
- C
It becomes faster but shallower, preventing carbon dioxide removal.
- D
It remains unchanged because blood flow alone supplies the alveoli with fresh air.
15
Choose one
1 point
Air entering through the nose is cold and contains particles. Which role of the nasal passages helps prepare this air before it travels deeper into the respiratory tract?
- A
Move air directly into the alveoli without conditioning it
- B
Warm, moisten, and filter incoming air
- C
Exchange gases with pulmonary capillary blood
- D
Transport oxygen from the lungs to tissues
16
Choose one
1 point
As the chest wall moves during breathing, what is the main role of the small amount of fluid between the visceral and parietal pleura?
- A
It prevents air from entering the lungs during inhalation
- B
It carries oxygen from alveoli to the heart
- C
It reduces friction and helps the lungs follow chest-wall movements
- D
It causes the lungs to recoil during quiet exhalation
17
True or false
1 point
During quiet exhalation, the diaphragm and external intercostal muscles relax, and elastic recoil helps push air out of the lungs.
- A
True
- B
False
18
Choose one
1 point
A region of the respiratory tract contains respiratory bronchioles, alveolar ducts, and alveoli. Which functional zone does it belong to?
- A
Respiratory zone
- B
Conducting zone
- C
Pharyngeal zone
- D
Pleural zone
19
Written response
1 point
What is the name for gas exchange between the blood and body tissues?
20
Written response
1 point
In what form is most carbon dioxide carried in the blood from tissues toward the lungs?