The maximum amount of oxygen which normal human blood absorbs and carries at sea level is ________ per 100 ml of blood.
Correct answer: B. 20 ml
- A. 10 ml
- B. 20 ml
- C. 30 ml
- D. 40 ml
Explanation
Each 100 ml of normal arterial blood carries about 20 ml of oxygen, mainly bound to haemoglobin and a small amount dissolved in plasma. Students may choose 10 ml because they count only dissolved oxygen and ignore the much larger haemoglobin-bound component.
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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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