Human Respiratory System Quiz Quiz

10 multiple choice questions

1. Where does gas exchange happen in the respiratory system?

A) Bronchi B) Alveoli C) Bronchioles D) Lungs

2. Which structure connects the trachea to the lungs?

A) Bronchi B) Alveoli C) Trachea D) Bronchioles

3. What does the diaphragm do during the breathing process?

A) Pumps blood B) Helps with breathing C) Filters air D) Produces mucus

4. When you breathe in, what happens to the diaphragm?

A) Relaxes and moves up B) Contracts and moves down C) Stays still D) Closes

5. What do cilia in the respiratory tract do?

A) Carry oxygen B) Trap dust and germs C) Produce sound D) Warm the blood

6. Which organ is the voice box located in the throat?

A) Trachea B) Larynx C) Pharynx D) Bronchus

7. In which direction does oxygen move during gas exchange?

A) From blood to alveoli B) From alveoli to blood C) Between bronchi D) Through the diaphragm

8. What is the function of the mucus in the respiratory system?

A) Produce mucus B) Move mucus upward C) Exchange gases D) Produce sound

9. What do red blood cells carry that helps fight infection?

A) Fights infection B) Carries oxygen C) Causes blood clotting D) Produces carbon dioxide

10. How is most carbon dioxide transported in the bloodstream?

A) Dissolved in plasma B) As bicarbonate ions and dissolved gas C) By white blood cells D) Attached to hemoglobin (as oxygen)

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