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Watch Later 6:28

Biological Concept-Ch.8 (15) - Blood circulation

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Biological Concept-Ch.8 (14) - How heart adapted to its function

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Biological Concept-Ch.8 (13) - Internal structure of heart

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Biological Concept-Ch.8 (12) - External structure of heart

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Biological Concept-Ch.8 (11) - 3 types of blood vessels

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Biological Concept-Ch.8 (10) - Blood pressure in different vessels

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Biological Concept-Ch.8 (9) - Capillary

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Biological Concept-Ch.8 (8) - Comparing between Artery and Veins

Watch Later 5:26

Biological Concept-Ch.8 (7) - Veins

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