Heart, lung & Respiration.

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Across
  1. 2. In muscle cells, what is the byproduct of anaerobic respiration?
  2. 5. Which blood vessels carry blood away from the heart?
  3. 6. What is the primary energy-carrying molecule produced in respiration?
  4. 9. What is the name of the sugar that is broken down during respiration?
  5. 10. What tiny air sacs in the lungs are the site of oxygen and carbon dioxide exchange?
  6. 14. What is the flap of tissue that prevents food from entering the trachea?
  7. 17. Which part of the lung is responsible for the distribution of air to the alveoli?
  8. 18. What type of blood vessel carries blood toward the heart?
  9. 19. What muscle contracts and relaxes to help inflate and deflate the lungs?
  10. 20. What is the main organ responsible for gas exchange in the body?
Down
  1. 1. What is the waste gas produced by aerobic respiration?
  2. 3. What is the tube that carries air from the throat to the lungs?
  3. 4. Which blood vessels exchange nutrients and oxygen with tissues?
  4. 7. Which two tubes branch off from the trachea and lead into the lungs?
  5. 8. What is the main organ responsible for pumping blood throughout the body?
  6. 11. What is the term for the movement of air into and out of the lungs?
  7. 12. What is the term for respiration that uses oxygen?
  8. 13. What is the name of the largest artery in the body?
  9. 15. What gas is required for aerobic respiration?
  10. 16. What is the muscular wall that separates the left and right sides of the heart?