Of the following, which one is better respiratory medium___________?
Correct answer: A. Air
- A. Air
- B. Water
- C. Soil
- D. None of these
Explanation
Air is a better respiratory medium than water because it contains a much higher concentration of oxygen and gases diffuse more rapidly through it. Students may choose water because aquatic animals also respire successfully, but water is a poorer medium and must be passed over respiratory surfaces continuously.
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About Gaseous Exchange in Lungs
Gaseous exchange in the lungs occurs across the thin, moist alveolar and capillary surfaces, where oxygen and carbon dioxide diffuse down partial pressure gradients. The topic covers alveolar adaptations, ventilation, the role of haemoglobin in oxygen transport, carbon dioxide carriage, and the difference between external gas exchange and cellular respiration.
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