micniell1Tian
micniell1Tian micniell1Tian
  • 13-05-2016
  • Biology
contestada

The heart valves act like doors.


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princesslove1234
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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