The haemoglobin of a human foetus:
Correct answer: B. Has a higher affinity for oxygen than that of an adult
- A. Has only 2 protein subunits instead of 4
- B. Has a higher affinity for oxygen than that of an adult
- C. Has a lower affinity for oxygen than that of the adult
- D. Its affinity for oxygen is the same as that of an adult.
Explanation
.Fetal hemoglobin has a higher affinity for oxygen compared to adult hemoglobin. This allows the fetus to effectively extract oxygen from the maternal blood across the placenta.
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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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