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how will you describe the pathway of the oxygen n the breathing system?
The oxygen first enters through our nose and then goes down to the trachea and passes numerous bronchioles down to alveoli. gaseous exchange takes place there. Then the oxygen enters the bloodstream and carried by haemoglobin towards the cells. Here oxygen is used to break down food to produce energy. Thus the path of blood is : -
Nose > Trachea > Lungs > Blood > heart > Cell > Mitochondria (where the breakdown of food occurs)
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