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A-Level Biology OCR A

Walls Ventricles Thicker Blood Explain Of  Atria Pump

Front Explain why the walls of ventricles are thicker than the walls of  the atria.
Back Walls of ventricles vs atria:
  • Their walls are thicker because they have to pump blood out of the heart
  • Atria only receive blood and pass it to ventricles

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