Answers

  • Brainly User
2014-08-07T20:17:00+05:30
Valve open in one direction like a trapdoors
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  • Brainly User
2014-08-07T20:20:27+05:30
Valves act as one way doors
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Valves open in only one side .i.e., when bicuspid and tricuspid valves are open , semilunar valves are remained closed and vise versa