Biology, 25.01.2020 12:31 arianawelsh123l
Blood enters the right atrium; it flows through a valve into the right which pumps it through which flow into capillaries in the where it gives off co2 and picks up o2. the oxygenated blood flows into back to the heart where it enters the left the blood flows through a valve into the left which pumps it through which branch into smaller where o2 is delivered to all body cells before returning through to the right of the heart.
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Blood enters the right atrium; it flows through a valve into the right which pumps it through whi...
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