Heart

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Across
  1. 1. slightly bigger then your fist
  2. 3. receives blood from lungs
  3. 5. has the thickest walls
  4. 7. has the thinnest walls
Down
  1. 2. pumps blood to lungs
  2. 4. pumps blood into ventricles
  3. 6. the thin outermost layer of the heart wall