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Text File  |  1999-11-09  |  113b  |  10 lines
  1. When the right and left atria contract, the AV valves are A
  2. open.  
  3. closed.
  4.  
  5.  
  6.  
  7.  
  8. [#FRAME:"TRM2S4C"]
  9. NONE
  10.