Beginner Alveoli Quiz

Q1. What is the main function of alveoli in the lungs?

• Secreting mucus
• Gas exchange
• Producing sound
• Filtering dust

Q2. What type of blood vessel surrounds the alveoli?

• Lymphatics
• Veins
• Arteries
• Capillaries

Q3. What gas do alveoli take in from inhaled air?

• Carbon dioxide
• Nitrogen
• Oxygen
• Helium

Q4. What gas is removed from the blood into the alveoli?

• Carbon dioxide
• Oxygen
• Nitrogen
• Hydrogen

Q5. What is the shape of an alveolus?

• Balloon-like sac
• Flat plate
• Tube
• Pyramid

Q6. Which cell type lines the alveoli and facilitates gas exchange?

• Type I pneumocytes
• Type II pneumocytes
• Ciliated epithelial cells
• Goblet cells

Q7. What substance reduces surface tension in alveoli?

• Water
• Surfactant
• Bile
• Mucus

Q8. Which cell in alveoli produces surfactant?

• Type II pneumocytes
• Basal cells
• Type I pneumocytes
• Alveolar macrophages

Q9. Why are alveoli so numerous in the lungs?

• To filter bacteria
• To cool air
• To produce sound
• To increase surface area for gas exchange

Q10. What keeps alveoli from collapsing during exhalation?

• Surfactant and residual air
• Muscle contractions
• Nerve signals
• Blood pressure