Christaincloud Christaincloud

25-07-2018
Biology

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Cells need oxygen to make energy oxygen rich blood is transported through structures that are small and thin

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shreyarakesh shreyarakesh

25-07-2018

Capillaries are small, thin blood vessels that connect the arteries and the veins. Their thin walls allow oxygen, nutrients, carbon dioxide and waste products to pass to and from the tissue cells.

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