Lungs and heart

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Across
  1. 3. Air-filled sack where gas exchange takes place
  2. 5. The cellular process in which oxygen is needed
  3. 7. The name of the arteries that supply the heart with blood
  4. 9. Number of heartbeats per minute
  5. 10. The pacemaker of the heart
  6. 11. Volume pumped out from the heart per beat
Down
  1. 1. The name of the valve between the left atria and ventricle
  2. 2. Heart rate x Stroke volume
  3. 4. The transport process that takes place in the lungs
  4. 6. The trachea ends in 2 of these
  5. 8. The numbers of chambers in the heart