Most of the oxygen carried in the blood is transported
Correct answer: D. bound to haemoglobin inside red blood cells
- A. dissolved in the plasma
- B. as bicarbonate ions
- C. as carboxyhaemoglobin
- D. bound to haemoglobin inside red blood cells
Explanation
About 97 per cent of oxygen rides on haemoglobin as oxyhaemoglobin, while only a small fraction dissolves in plasma. Bicarbonate carries carbon dioxide, not oxygen, and carboxyhaemoglobin is the poisonous CO complex.
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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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