Respiratory and circulatory systems

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Across
  1. 2. Blood vessels that carry blood away from the heart.
  2. 4. Site of gas exchange in the lungs.
  3. 7. Process of exchanging gases in the body.
  4. 9. Part of the throat behind the mouth and nasal cavity.
  5. 10. Also known as the windpipe.
Down
  1. 1. Blood vessels where exchange with body cells occurs.
  2. 3. Protein in red blood cells that carries oxygen.
  3. 5. Blood vessels that return blood to the heart.
  4. 6. Muscle that plays a key role in breathing.
  5. 8. Essential gas provided by the respiratory system.