The lungs

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Across
  1. 3. The ribcage moves ____wards and outwards during inspiration
  2. 4. The lungs ensure efficient gas ___________ between the air and the blood
  3. 7. _________ volume: the volume of air in each breath
  4. 9. The __________ of the thorax increases during inspiration
  5. 10. The ___________ separates the thorax from the abdomen
  6. 12. The volume of the ________ decreases during expiration
  7. 13. The ___________ muscles lie between the ribs
  8. 15. A protein which makes up the walls of the alveoli is called _________
  9. 18. The process of breathing in
  10. 20. The diaphragm is a _________
Down
  1. 1. As the volume of the thorax decreases the lung __________ decreases
  2. 2. The ribcage moves _______wards and inwards during expiration
  3. 5. The _____________ of the diaphragm causes it to flatten
  4. 6. The __________ is where gas exchange takes place
  5. 8. The smallest type of blood vessels are known as _____________
  6. 11. The _________ intercostal muscles relax during expiration
  7. 14. A ________ is a blood vessel that contains valves
  8. 16. The __________ is a flexible airway that is supported by cartilage
  9. 17. Each bronchus branches of into a smaller tube known a ______________
  10. 19. Expiration is a _________ process-it doesn't require energy