Lungs are spongy due to the presence of million of___________?
Correct answer: B. Alveoli
- A. Air sacs
- B. Alveoli
- C. Bronchioles
- D. Parabronchi
Explanation
The lungs are spongy because they contain millions of alveoli, tiny air sacs surrounded by capillaries that provide a large surface area for gas exchange. Students may choose bronchioles because they branch extensively inside the lungs, but bronchioles are air passages and do not provide the main exchange surface.
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About Human Respiratory System
The human respiratory system conducts air to the alveoli, where oxygen and carbon dioxide exchange occurs across thin respiratory surfaces. Questions cover the nasal passage, trachea, bronchi, lungs, diaphragm and intercostal muscles, ventilation mechanics and gas transport, while distinguishing breathing and gaseous exchange from cellular respiration.
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