01
Written response
1 point
In a diagram, label the pleural membrane lining the inner chest wall, rather than the membrane covering the lung. Enter the membrane name.
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
Fill in the blank
1 point
The right lung has lobes, while the left lung has lobes, leaving room for the heart.
03
True or false
1 point
During quiet exhalation at rest, air flows out mainly because the diaphragm and external intercostal muscles relax and elastic recoil reduces lung volume.
- A
True
- B
False
04
Choose one
1 point
A region of the airway warms, humidifies, and filters incoming air but does not exchange gases. Which zone does this region belong to?
- A
Conducting zone
- B
Respiratory zone
- C
External respiration
- D
Internal respiration
05
Written response
1 point
Most oxygen in the blood is carried reversibly bound to which iron-containing protein in red blood cells? Enter the protein name.
06
Fill in the blank
1 point
In the conducting zone, mucus particles, while move the mucus toward the throat.
07
Choose one
1 point
Which sequence best explains how contraction of the diaphragm helps draw air into the lungs during inhalation?
- A
The diaphragm relaxes, lung pressure rises, and air flows into the lungs.
- B
The diaphragm contracts, chest volume decreases, and air flows into the lungs.
- C
The diaphragm contracts and flattens, the chest cavity expands, and lung pressure falls below atmospheric pressure, causing air to flow into the lungs.
- D
The external intercostals relax, the ribs lift, and lung pressure falls below atmospheric pressure.
08
Choose one
1 point
In the lungs, which direction do oxygen and carbon dioxide diffuse during external respiration?
- A
Oxygen moves from alveoli to blood, and carbon dioxide moves from blood to alveoli.
- B
Oxygen moves from blood to alveoli, and carbon dioxide moves from alveoli to blood.
- C
Both oxygen and carbon dioxide move from alveoli to blood.
- D
Both oxygen and carbon dioxide move from blood to alveoli.
09
Choose all
1 point
Which features of alveoli support rapid gas exchange with pulmonary blood? Select all correct choices.
- A
Their walls are thin, creating a short diffusion distance.
- B
They provide a large surface area for diffusion.
- C
Their thick walls slow gas movement and protect the capillaries.
- D
They lie next to pulmonary capillaries.
10
True or false
1 point
During internal respiration, oxygen diffuses from blood into body tissues, while carbon dioxide diffuses from tissues into blood.
- A
True
- B
False
11
Choose all
1 point
Which statements correctly describe carbon dioxide transport in the blood? Select all correct choices.
- A
Most carbon dioxide travels as bicarbonate ions in plasma.
- B
Most carbon dioxide is carried dissolved in plasma.
- C
Some carbon dioxide binds to hemoglobin or remains dissolved in plasma.
- D
Carbonic anhydrase slows the conversion of carbon dioxide to bicarbonate.
- E
In the lungs, reactions convert bicarbonate back to carbon dioxide, which can diffuse into the alveoli.
12
Choose one
1 point
A person’s total ventilation includes air that remains in the conducting passages. Why does this make alveolar ventilation lower than total ventilation?
- A
It is the volume of blood reaching pulmonary capillaries each minute.
- B
It is air in the alveoli that has completed gas exchange.
- C
It is the portion of carbon dioxide carried by hemoglobin.
- D
It is air remaining in conducting passages, so it does not reach gas-exchanging surfaces.
13
Open ended
1 point
Explain why efficient gas exchange requires both ventilation and perfusion. Then describe what would limit gas exchange if an alveolus received air but had inadequate blood flow in its capillaries.
14
Choose one
1 point
Particles become trapped in mucus lining the airways. What is the main role of cilia in helping clear these particles?
- A
They exchange oxygen and carbon dioxide directly with the blood.
- B
They move particle-trapping mucus toward the throat.
- C
They cause the lungs to expand during inhalation.
- D
They carry oxygen from the lungs to body tissues.
15
Choose one
1 point
Why does the left lung have fewer lobes than the right lung?
- A
It has an extra lobe to support greater airflow.
- B
It has two lobes, leaving room for the heart.
- C
It has two lobes because it does not rest on the diaphragm.
- D
It has three lobes, but one is separated by the heart.
16
Choose one
1 point
Which sequence correctly describes the main events that draw air into the lungs during inhalation?
- A
The diaphragm relaxes, chest volume decreases, and lung pressure falls.
- B
The diaphragm contracts, chest volume decreases, and lung pressure rises.
- C
The diaphragm contracts and flattens, chest volume increases, and lung pressure falls.
- D
The diaphragm relaxes, chest volume increases, and lung pressure rises.
17
True or false
1 point
True or false: Internal respiration describes oxygen diffusing from blood into body tissues while carbon dioxide diffuses from tissues into blood.
- A
True
- B
False
18
Written response
1 point
What iron-containing protein in red blood cells binds most of the oxygen transported in blood?
19
Choose one
1 point
A person moves a certain volume of air in and out of the lungs, but some of that air remains in conducting passages. Why is the volume reaching the alveoli each minute lower than total ventilation?
- A
Some inhaled air remains in conducting passages and does not reach gas-exchanging surfaces.
- B
The alveoli absorb all inhaled air before it reaches the lungs.
- C
The blood reaching the lungs is unable to carry respiratory gases.
- D
The lungs use some inhaled air to create mucus.
20
Written response
1 point
What is the name of the thin gas-exchange interface formed where alveolar walls lie next to pulmonary capillaries?