Biology 2

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Across
  1. 1. movement of air in and out of the lungs
  2. 7. tiny air sacs on the end of the bronchihole
  3. 10. takes oxygen into the body when we inhale and releases carbon dioxide
  4. 15. allowing certain substances to pass through it but not others
  5. 16. group of organs working together to carry out a particular function
  6. 19. a flap that cover the trachea from food blocking
Down
  1. 2. filters warm and moisten and humidifies the air
  2. 3. expands when exhales and contract when inhaled
  3. 4. air enters alveoli
  4. 5. a group of cells working together to carry out a particular function
  5. 6. the exchange of carbon dioxide and oxygen in a cell in its environment
  6. 8. the voice box with vocal cords
  7. 9. passageway for air to enter lungs
  8. 11. an air passageway into the throat
  9. 12. muscles breathing by increasing and decreasing volume in thoraic cavity
  10. 13. group of tissues work together to carry out a particular function
  11. 14. process which glucose and oxygen produce energy carbon dioxide and water are waste
  12. 17. building blocks of all living organisms
  13. 18. movement of particles from an high area of concentration to low area of concentrati