The given graph shows the haemoglobin saturation curve. The relative oxygen concentration in body tissues and lungs as presented in the graph is
Correct answer: A. Low in tissues, high in lungs
- A. Low in tissues, high in lungs
- B. High in tissues, low in lungs
- C. Equal in tissues and lungs
- D. Varies independently of tissues and lungs
Explanation
The correct answer is that the relative oxygen concentration is low in body tissues and high in the lungs. This is because the lungs are responsible for oxygen intake, resulting in higher oxygen concentration. As blood circulates through the body, oxygen is delivered to tissues where it is used for cellular processes, leading to lower oxygen concentration in those areas. The incorrect options either misrepresent the relationship between oxygen concentration in tissues and lungs or suggest an unrealistic scenario where the concentration is equal or independent.
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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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