Explain the process of gaseous exchange in human being
Answers
When we inhale atmospheric air, through the nose it go to the trachea and then via bronchus and bronchioles it ultimately go to the alveoli where exchange of different gas takes place. Alveoli is the sac filled with air and it is functional unit of lung. Gaseous exchange occur here. This alveoli 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.
So, we can see that oxygen and carbondioxide, this 2 major gas exchanged from alveoli to blood and from blood to alveoli respectively by diffusion in the lung. This exchange happening maximum in base of the lung and minimum in apex of the lung.
Answer:When we inhale atmospheric air, through the nose it go to the trachea and then via bronchus and bronchioles it ultimately go to the alveoli where exchange of different gas takes place.In the lungs, the wind pipe branches into bronchi which, in turn, branches into smaller tubes called bronchioles. Bronchioles have pouch like air-sacs at their ends called alveoli. Each lung contains about 300 - 350 millions of alveoli. The alveoli provides maximum surface area for exchange of gases. They have very thin walls and are surrounded by an extensive network of blood vessels to facilitate exchange of gases.