Respiratory System

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Across
  1. 3. tubular passageway that extends from the larynx to the superior boarder of the fifth thoracic vertebra
  2. 5. oxygen is bound to this in red blood cells
  3. 7. The movement of particles down a concentration gradient, from an area of high concentration to an area of low concentration.
  4. 10. increases surface area in the nasal cavity
  5. 11. the volume of one breath
  6. 13. voice box
  7. 14. breathing in
  8. 16. trachea is prevented from closing at expiration by
  9. 17. breathing out
  10. 20. large leaf-shaped piece of elastic cartilage that acts as a trap door when swallowing
  11. 22. the percent of oxygen at room air (answer contains a hyphen)
Down
  1. 1. throat
  2. 2. trachea divides into left and right primary ?
  3. 4. date product of respiration (answer contains a hyphen)
  4. 6. double layered serous membrane enclosing and protecting each lung
  5. 8. these divide the lungs into lobes
  6. 9. remove dust particles and other debris from the alveoli
  7. 12. lowers surface tension in the alveoli
  8. 15. small muscles of breathing found between each rib
  9. 18. major muscle of respiration
  10. 19. gaseous exchange take place here
  11. 21. the movement of water from a less concentrated solution to a more concentrated solution through a partially permeable membrane.