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(i) The smallest vessels have walls which are one-cell thick and are called capillaries. Exchange of material between the blood and surrounding cells takes place a cross this thin wall.
(ii) Schematic representation of transport and exchange of oxygen and carbon dioxide.
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(i) The smallest vessels have walls which are one-cell thick and are called capillaries. Exchange of material between the blood and surrounding cells takes place a cross this thin wall.
(ii) Schematic representation of transport and exchange of oxygen and carbon dioxide.
Hope it helps you !
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