gas exchange occurs between the thin walls of the alveoli and the thin walls of the capillaries
The gas occurs by simple diffusion through the cells.
gills
the alveolus
in the leaf
capillaries
in the leave
gas exchange occurs between pulmonary capillaries and the alveoli in the lungs.
in their gills.
In the alveoli
lungs
--it is in the alveoli where the exchange of gases occur.. :))
Capillaries