Hemoglobin can absorb maximum oxygen at sea level, which is _ ml/100 ml of blood.
Correct answer: D. 20
- A. 15
- B. 19
- C. 19.6
- D. 20
- E. 25
Explanation
At sea level, hemoglobin can carry a maximum of approximately 20 ml of oxygen per 100 ml of blood. This capacity is influenced by several factors, including atmospheric pressure and hemoglobin's affinity for oxygen. The other options (15 ml, 19 ml, 19.6 ml, and 25 ml) do not accurately reflect this maximum saturation. Specifically, 15 ml and 19 ml are too low, and 25 ml exceeds the physiological capacity of hemoglobin.
This question appeared on the NUMS 2019 (cancelled sitting) paper, which you can sit online with every answer explained.
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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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