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2014-12-18T13:19:06+08:00

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The blood will flow backwards....

--Mizu
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2014-12-25T10:14:34+08:00

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
the valves protect the blood to flow one direction if the doors do not close the blood will flow backwards and it might be going to the other valves and causing to had a heart failure.the heart will stop to pump.

(^_^)hope it can help.......
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