Which substance produced by type II alveolar cells helps prevent alveolar collapse?
Correct answer: B. Surfactant
- A. Mucus
- B. Surfactant
- C. Bicarbonate
- D. Haemoglobin
Explanation
Surfactant reduces surface tension inside the alveoli and helps keep them open, especially during expiration. Haemoglobin transports oxygen in blood, while mucus mainly traps particles in conducting airways.
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About Respiratory System
The respiratory system includes the air passages, lungs, pleura, alveoli and the mechanics of breathing. It explains pulmonary ventilation, gas exchange, oxygen and carbon dioxide transport, regulation of breathing, and the difference between external respiration in the lungs and internal respiration in body tissues.
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