The oxygen molecules should be absorbed via moist respiratory surfaces in humans that diffuse immediately into the blood capillaries.
The capillaries should be considered as the small blood vessels that have thin walls, The oxygen and nutrient arise from the blood should be shifted via the walls and get into the organs and tissues.
Here the capillaries should be considered as the wastage products that are away from the tissues.
Also, there are exchange for the wastage and carbon dioxide.
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