Explain the mechanism of gaseous exchange between the tissue and the blood.

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Solution

The arteries carry oxygenated blood from the heart to the tissues. The arteries divide into small capillaries. Through very thin wall of capillaries Oxygen diffuse in tissues and CO₂ diffuse in the capillaries. These capillaries join and form vein which now carries deoxygenated blood from tissue to heart for the purification of blood.

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