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Free Practice Quiz Question List

10 The Respiratory System Online Quiz Questions

Use this free practice quiz with 20 questions to review 10 The Respiratory System, test your knowledge, and prepare for your next test or exam.

20 questions
01
True or false
1 point

During inhalation, the diaphragm contracts and moves downward, helping increase chest-cavity volume and draw air into the lungs.

  1. A

    True

  2. B

    False

02
Choose one
1 point

Which sequence correctly follows air through the branching airways from the trachea toward the gas-exchange sites?

  1. A

    Trachea → bronchioles → bronchi → alveoli

  2. B

    Trachea → bronchi → bronchioles → alveoli

  3. C

    Bronchi → trachea → alveoli → bronchioles

  4. D

    Trachea → alveoli → bronchi → bronchioles

03
Fill in the blank
1 point

At body tissues, leaves the blood and enters cells, while produced by cells enters the blood.

04
Choose one
1 point

Why do the very thin walls of alveoli and surrounding capillaries support gas exchange?

  1. A

    They produce oxygen for the blood.

  2. B

    They pump carbon dioxide out of the capillaries.

  3. C

    They provide a short barrier across which gases can diffuse.

  4. D

    They prevent gases from moving between air and blood.

05
True or false
1 point

Most oxygen travels through the bloodstream attached to hemoglobin in red blood cells.

  1. A

    True

  2. B

    False

06
Written response
1 point

In what form is much of the carbon dioxide carried in the blood?

07
Fill in the blank
1 point

At the alveoli, diffuses into the blood, while moves from the blood into the alveoli.

08
Choose one
1 point

After gas exchange in the lungs, which vessels carry oxygen-rich blood back toward the left side of the heart?

  1. A

    Pulmonary arteries

  2. B

    Pulmonary veins

  3. C

    Bronchioles

  4. D

    Systemic arteries

09
Choose all
1 point

Select all statements that correctly describe gas exchange between alveoli and blood.

  1. A

    Oxygen diffuses from alveolar air into the blood.

  2. B

    Oxygen diffuses from the blood into the alveolar air.

  3. C

    Carbon dioxide diffuses from the blood into the alveoli.

  4. D

    Gas exchange between alveoli and blood is called external respiration.

10
Choose all
1 point

During exercise, select all changes or effects described for the body's response to the increased demands of working muscles.

  1. A

    Working muscles use more oxygen.

  2. B

    Working muscles produce more carbon dioxide.

  3. C

    The lungs stop exchanging gases during exercise.

  4. D

    Breathing and heart rate increase to support gas transport.

11
Choose one
1 point

A person's blood carbon dioxide level changes. Which response is consistent with how breathing is regulated?

  1. A

    It slows breathing whenever blood carbon dioxide rises.

  2. B

    It regulates breathing only when oxygen is absent.

  3. C

    It adjusts breathing in response to blood-gas changes, especially carbon dioxide.

  4. D

    It prevents breathing from changing during exercise.

12
True or false
1 point

As incoming air passes through the nose, the nose helps warm and moisten it.

  1. A

    True

  2. B

    False

13
Open ended
1 point

Compare external respiration with internal respiration. For each, identify where gas exchange occurs and describe the directions in which oxygen and carbon dioxide move.

14
Choose one
1 point

Which sequence correctly shows the structures air passes through on its way from the nose or mouth to the trachea?

  1. A

    Nose or mouth → throat → larynx → trachea

  2. B

    Nose or mouth → larynx → throat → trachea

  3. C

    Nose or mouth → trachea → throat → larynx

  4. D

    Nose or mouth → throat → trachea → larynx

15
Choose one
1 point

Which structures are the tiny air sacs in the lungs where gas exchange occurs?

  1. A

    Bronchi

  2. B

    Bronchioles

  3. C

    Alveoli

  4. D

    Capillaries

16
Choose one
1 point

What happens to the chest cavity and airflow when the diaphragm relaxes?

  1. A

    The chest cavity becomes larger, drawing air into the lungs.

  2. B

    The chest cavity becomes smaller, and air flows out of the lungs.

  3. C

    The chest cavity stays the same size, and air flows out of the lungs.

  4. D

    The chest cavity becomes smaller, drawing air into the lungs.

17
Written response
1 point

What is the two-word name for gas exchange between the alveoli and the blood?

18
Written response
1 point

In what form is much of the carbon dioxide carried in the blood?

19
Choose one
1 point

Which statement correctly describes the direction of blood flow in the pulmonary arteries and pulmonary veins?

  1. A

    Pulmonary arteries carry oxygen-rich blood away from the lungs; pulmonary veins carry low-oxygen blood toward them.

  2. B

    Both pulmonary arteries and pulmonary veins carry blood toward the lungs.

  3. C

    Pulmonary arteries carry blood away from the lungs; pulmonary veins also carry blood away from them.

  4. D

    Pulmonary arteries carry blood toward the lungs; pulmonary veins carry blood away from them.

20
Written response
1 point

When the diaphragm relaxes and air flows out of the lungs, what happens to the volume of the chest cavity?