Respiratory system

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Across
  1. 3. blood vessels surrounding the alveoli
  2. 4. protects lungs from getting punctured
  3. 7. mechanical process of inhaling and exhaling air
  4. 8. the simplest form of sugar
  5. 10. branch of air tubes in the lungs
  6. 12. structure where gas exchange happens
  7. 13. incomplete respiration due to absence of oxygen
Down
  1. 1. site where respiration happens
  2. 2. process of releasing energy from food
  3. 5. one of the organs for the respiratory system
  4. 6. one of the product of respiration
  5. 9. gas that is needed for respiration process
  6. 11. also known as trachea