circulatory and respratory

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Across
  1. 2. A blood vessel that carries blood toward the heart.
  2. 4. The process in which oxygen is combined with food (glucose) to release energy.
  3. 6. The tube that transports air from the throat to the lungs, also called the windpipe.
  4. 10. a transport system that uses blood to carry nutrients and oxygen to the cells of the body.
  5. 11. Either lower chamber of the heart.
  6. 12. A pair of tubes that branch off the trachea and enter the lungs.
  7. 13. a muscular organ that pumps blood throughout the body.
Down
  1. 1. A sheet-like muscle beneath the lungs that expands and contracts the chest cavity to control breathing.
  2. 3. The body system that takes in oxygen and release carbon dioxide.
  3. 5. Either upper chamber of the heart.
  4. 7. air sacs within the lungs where gases are exchanges between the lungs and the blood.
  5. 8. Elastic, sponge-like organs in the chest that are the main organs of the respiratory system.
  6. 9. a yellowish fluid that is mostly water in which blood cells are suspended.