Question

name the structure in the lungs where exchange of gases occurs also mention its characteristics wch enables it for exchange of gases

Answer 1

Alveolus is the sac filled with air and it is functional unit of lung. Gaseous exchange occur here. This alveolus separated from blood by a membrane called Alveo-capillary membrane. It is the barrier between air and blood. Different gaseous overcome this barrier by Diffusion method. In diffusion method gaseous go from high concentrated area to low concentrated area. So, Oxygen which is more in concentration in alveolus and low in blood, go to the blood from alveolus and carbon-di-oxide which is more in concentration in pulmonary capillary & low in alveolus go to the alveolus from pulmonary capillary blood

Answer 2

I think In alveoli at the end of bronchial tubes is the structure in the lungs where exchange of gases occurs .
characteristics are-----
alveoli provided the lung a large surface area.
they have a tiny blood vessels called as capillaries.