Respiratory system in humans

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Across
  1. 1. vocal cords are located in ...
  2. 4. Element present in haemoglobin.
  3. 6. Trachea is protected from collapsing and closing
  4. 8. Gaseous exchange takes place in lungs
  5. 9. Dome shaped muscular flap below the chest cavity.
  6. 10. Movement of air into and out of lungs is called..
Down
  1. 1. Who found that the air we breath out prespitate lime water.
  2. 2. flap like structure which prevents the food entering into wind pipe.
  3. 3. Energy releasing process
  4. 5. Where air is filtered in our repirstory tract
  5. 7. wind pipe is commonly called as