lungs
The gas occurs by simple diffusion through the cells.
the alveolus
in the leave
gills
gas exchange occurs between the thin walls of the alveoli and the thin walls of the capillaries
in their gills.
In the alveoli
Gas exchange does not occur in the pleura. The pleura is a membrane that lines the outside of the lungs and inside of the chest cavity. Gas exchange, where oxygen is taken in and carbon dioxide is removed, happens in the alveoli of the lungs.
The chorion develops into the fetal portion of the placenta. It plays a crucial role in nutrient and gas exchange between the mother and the fetus during pregnancy.
Capillaries
Between the avioli and the lungs.
Gaseous exchange takes place when the volume of the chest cavity is increased or decreased.