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You do not have anything like bronchus in your lungs. Air passes from nose to pharynx, larynx and then to trachea. Trachea divides into two branches. One each for both lungs. Each of them is called as primary bronchus. Each divide into ten branches. Each of them divide into two branches. This type of branching reapeates for about seventeen times. So at last you have terminal bronchioles. So number of bronchi is very large. This is there to increase the surface area of the gaseous exchange. Function of the bronchi is to transfer the air to alveoli. to get the number of alveoli, you have to multiply the number of bronchi six more times. This gives you the surface area of about hundred squre meters for gaseous exchange.

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Yasmine Welch

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2y ago

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