Lesson 1, Topic 1
In Progress


It is through the alveolo-capillary membrane that gas exchangees are carried out that allow oxygen to be brought to cells and release carbon dioxide resulting from metabolism.

Venous blood (rich in carbon dioxide, CO2) circulating in the network of capillary vessels around the alveolo, releases CO2 into the alveolo and in return receives oxygen from the inspired air inside the alveolo, turning into arterial blood (rich in oxygen, O2).

To this transformation of venous blood into arterial blood is called hematosis .