Circulatory and Respiratory System

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Across
  1. 5. pockets in lungs where gas exchange happens
  2. 6. the movement of muscles in respiratory system
  3. 8. your blood is carried around the body by this organ
  4. 10. a pale yellow liquid in your blood
  5. 13. a substance that an organism needs to stay healthy
  6. 14. substance that traps oxygen
  7. 15. a thick liquid in your nose
  8. 16. other word for breathing out
Down
  1. 1. largest tube in respiratory system
  2. 2. this type of blood protects your body from infections
  3. 3. a process where particles move from a place with many particles to fewer particles
  4. 4. a waste product of respiration which your lungs excrete
  5. 7. other word for breathing in
  6. 9. the main organ of circulatory system
  7. 10. microorganisms that cause disease
  8. 11. plants have holes on their leaves
  9. 12. organ that allow oxygen into the blood