micniell1Tian micniell1Tian

13-05-2016
Biology

Answered

The heart valves act like doors.

TrueFalse

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princesslove1234 princesslove1234

13-05-2016

its true as you breath your heart and lungs go in and out as if you were swinging a door open and shut letting oxgen in and out hope i could help :)

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