The RESPIRATORY SYSTEM PROCESS

1.          We breathe in air through our nose and mouth.

2.          The pharynx opens and the air goes down a tube called trachea.

3.          The air travels through two tubes called bronchi and enters the lungs.

4.          The OXYGEN from the air passes from the lungs into our blood.

5.          When we breathe out, CARBON DIOXIDE leaves our lungs.