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The smallest functional unit of respiratory system is alveoli. Gaseous exchange takes place here. * The alveoli are attached to bronchules. * bronchules to bronchus. * bronchus to trachea the windpipe.
Wiki User
∙ 15y ago
Wiki User
∙ 7y agoThere are about 300 million alveoli in each of your lungs. These tiny air sacs provide an ideal site for the diffusion of gases into and out of the blood – also known as gaseous exchange.
The alveoli have a very large surface area – in fact if all of the alveoli in your lungs were spread out flat they would cover the area of a tennis court. This large surface area is the result of all the alveoli being small spheres.If your lungs were simply two large balloon-like structures, the surface area wouldn’t be big enough for you to get enough oxygen by diffusion to supply the needs of your cells.
But each alveolus is a very tiny sphere. The smaller the radius of a sphere, the bigger the relative surface area – halving the radius increases the relative surface area by a factor of four.
Wiki User
∙ 14y agoThe bronchi.
Wiki User
∙ 8y agothe alveoli
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