Question
How and where is the blood enriched with oxygen in human beings ?
✓
Answer
In human beings, blood is enriched with oxygen in alveoli where exchange of gases takes place by diffusion.
The inhaled air, which is rich in oxygen reaches alveoli after passing through trachea, bronchi and bronchioles. It contains very little carbon dioxide. The blood capillaries surrounding the alveoli, on the other hand, contain blood
that has more carbon dioxide and less oxygen. Thus, oxygen diffuses through the thin walls of the capillaries into the blood and combines with haemoglobin in the red blood cells (RBCs) and forms oxyhaemoglobin. The blood enriched with oxygen is then carried to
The inhaled air, which is rich in oxygen reaches alveoli after passing through trachea, bronchi and bronchioles. It contains very little carbon dioxide. The blood capillaries surrounding the alveoli, on the other hand, contain blood
that has more carbon dioxide and less oxygen. Thus, oxygen diffuses through the thin walls of the capillaries into the blood and combines with haemoglobin in the red blood cells (RBCs) and forms oxyhaemoglobin. The blood enriched with oxygen is then carried to
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