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 - it is another example of the
importance of the surface area- to-volume ratio.
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.
The millions of tiny alveoli in the human lungs are a very effective adaptation which provides a huge surface area for gaseous exchange into and out of the blood.
The alveoli have a good air supply from the bronchioles and a rich blood supply.
This is vital for successful gaseous exchange because it maintains a steep concentration gradient for oxygen from the air in the alveoli to the blood, and for carbon dioxide from the blood to the alveoli.
they are stored in the lungs
In the lungs
Alveoli
There are alveoli in your lungs and in your mouth.
Respiratory. They are the air sacs in your lungs.
The respiratory and circulatory systems are involved in the exchange of gases between the alveoli and blood. The alveoli are part of the lungs, and their surrounding capillaries are part of the circulatory system.
alveoli take co2 from
The alveoli of the lungs
3oo million alveoli
what are the 2 pipes air pass through before reaching the alveoli ?
air sacs in the lungs
Alveoli.
The oxygen is taken from the alveoli in the lungs.
Alveoli