A large proportion of oxygen remains unused in the human blood even after its uptake by the body tissues. This O2 _.
Correct answer: A. Acts as a reserve during muscular exercise
- A. Acts as a reserve during muscular exercise
- B. Raises the pCO2 of blood to 75 mmHg
- C. Is enough to keep oxyhaemoglobin saturation at 96%
- D. Helps in releasing more O2 to the epithelial tissues
Explanation
The unused oxygen in the blood acts as a reserve, which can be utilized during physical activities such as exercise when the body's oxygen demand increases. This ensures sufficient oxygen supply to the muscles.
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About Respiration
The human respiratory system includes the air passages, lungs, alveoli and breathing muscles, while gaseous exchange explains how oxygen enters blood and carbon dioxide leaves it by diffusion. The effects of smoking include damage to cilia and alveoli, reduced gas exchange, chronic bronchitis, emphysema and increased risk of lung cancer.
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