Alveoli short note
Alveoli is a plural form of alveolus which is the primary site of gaseous exchange inside the lungs. Basically alveolus is a hollow space which is supplied with blood capillaries for gaseous exchange on either side of the lungs. These alveolus have an average diameter of 200 microns and approx. 700 millions alveoli are found in a pair of lungs.