The exchange of material between the blood and surrounding cells takes places through :
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The site of exchange of materials between blood and the surrounding cells is capillaries. Blood capillaries are the smallest vessels and are only one cell thick. Hence, exchange of materials can easily occur by diffusion across the membranes of blood capillaries.
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capillaries
in placenta there is the substance called villi and in its surroundings there is space for exchange of glucose and oxygen
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