Question

explain alveoli working while exchange of gases

Answer 1

The gases move by diffusion from where they have a high concentration to where they have a low concentration: Oxygen diffuses from the air in the alveoli into the blood. Carbon dioxide diffuses from the blood into the air in the alveoli.

Answer 2

Alveoli are modified to increase the surface area each lung contains alveoli equal to surface area of 80m2 note that alveoli have a rich supply of blood

exchange of gasses:- it occurs in the alveoli. fresh air has a high concentration of oxygen and a very low concentration of carbon dioxide as a result, oxygen diffuses from alveolar air to blood present in capillaries around the alveoli. co2 diffuses from blood into the alveolar air