Breathing
1)is a mechanical process that involves two steps - taking in oxygen from the air and giving out carbon dioxide to the air.

2)The action of taking in air rich in oxygen is termed as
  

3)The action of giving out air rich in carbon dioxide is called
  

4)The number of times you breathe in one minute is called the
  

5)After air enters the nostrils, it passes through the

6)From the nasal cavity, air travels through the pharynx, larynx, and windpipe before it reaches the lungs located in the

7)The lungs rest on a large muscular sheet, called the .

8)The contracts and this reduces the size of the chest cavity.

9)The carbon dioxide released by the cells is carried by the trachea and given out through the .

10)In earthworm, the exchange of gases occurs through the
  


  


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