Human Respiratory System 50 Quizzes

Here are 50 quiz questions on the Human Respiratory System with multiple-choice answers:




1. What is the primary function of the respiratory system?

A) Digest food​
B) Exchange gases​
C) Pump blood​
D) Produce hormones

Answer: B




2. Which organ is the main site for gas exchange in the respiratory system?

A) Trachea​
B) Bronchi​
C) Alveoli​
D) Larynx

Answer: C




3. What muscle plays a key role in breathing by contracting and relaxing?

A) Biceps​
B) Diaphragm​
C) Heart​
D) Abdominal muscles

Answer: B




4. Air enters the respiratory system through the:

A) Mouth and nose​
B) Esophagus​
C) Stomach​
D) Lungs

Answer: A

, 5. What is the tube that connects the throat to the lungs called?

A) Esophagus​
B) Trachea​
C) Bronchus​
D) Pharynx

Answer: B




6. The voice box is also known as the:

A) Pharynx​
B) Larynx​
C) Bronchi​
D) Alveoli

Answer: B




7. Which structure prevents food from entering the trachea during
swallowing?

A) Epiglottis​
B) Bronchi​
C) Nasal cavity​
D) Diaphragm

Answer: A




8. The bronchi branch into smaller tubes called:

A) Bronchioles​
B) Alveoli​
C) Trachea​
D) Pharynx

Answer: A