What is the smallest function unit of respiratory system?

Answer 1

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.

Answer 2

There 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.

Answer 3

The alveoli are the smallest functional units of the respiratory system. They are tiny air sacs in the lungs where gas exchange occurs, allowing for the transfer of oxygen from the air into the blood and the removal of carbon dioxide from the blood into the air.

Answer 4

The bronchi.

Answer 5

the alveoli