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Now, in this topic we will go through the process of our respiratory system, how it work out. Respiratory system is the second main system of our body. Its function is to purify the blood and to supply it into the whole body through heart. Respiration is the process which supports breathing in which  we inhale oxygen and exhale carbon dioxide.
The main organs of respiratory system are
NOSE
WIND PIPE (TRACHEA)
LUNGS
BRONCHUS
BRONCHITIS
BRONCULES
ALVEOLI


Oxygen enters in our body through the nose and it goes through windpipe, when wind pipe is divided into two ie. known as Bronchitis. When bronchitis are further divided into branches, they are known as bronchus. And bronchus is again divided into broncules At the ends of the broncules, there are small rounded knot like structure, they are known as Alveoli. All these broncules and alveoli are present in lungs. As the oxygen enters into the windpipe, it will goes through bronchus into our lungs, exchange of gases takes place in the lungs through alveolie by the process of diffusion, which results in emission of carbon dioxide. As alveoli are surrounded by so many veins which carry impure blood (the blood which carries carbon dioxide). Now, as concentration of carbon dioxide in the veins are more than in the alvoelie, so it will move from higher concentration to lower concentration area and as concentration of oxygen is more in the alvoelie than veins, so oxygen will move from alveolie to vein and mixes with blood. By this process blood is purified and send back to heart and carbon dioxide is thrown out from our body.