Christaincloud Christaincloud
  • 25-07-2018
  • Biology
contestada

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

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shreyarakesh
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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