Heart & Lungs

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Across
  1. 2. – Throbbing of arteries due to heartbeat
  2. 5. – Breathing out
  3. 8. – Tiny air sacs in lungs where gas exchange happens
  4. 10. – Largest artery in the body
  5. 11. – Tiny blood vessels where oxygen and CO₂ are exchanged
  6. 14. – Breathing in
  7. 15. – Heart tissue responsible for contractions
  8. 16. – Lower heart chamber that pumps blood out
  9. 19. – Device or group of cells that controls heart rhythm
Down
  1. 1. – Thin membrane surrounding the lungs
  2. 2. – Membrane that surrounds and protects the heart
  3. 3. – Arteries supplying blood to the heart muscle
  4. 4. – Prevents backflow of blood in the heart
  5. 6. – Blood vessel that carries blood away from the heart
  6. 7. – Dome-shaped muscle under lungs that aids in breathing
  7. 9. – Essential gas taken in by the lungs
  8. 12. – Upper chamber of the heart
  9. 13. – Air passages that branch from the trachea into lungs
  10. 17. – Windpipe; carries air to the lungs
  11. 18. – Refers to carbon dioxide, the gas we exhale