Which of the following is responsible for the movement of O2 from the alveoli into the blood in the pulmonary capillaries?
Gases diffuse from the alveoli to the blood in the pulmonary capillaries or vice versa across the thin alveolocapillary membrane made up of the pulmonary epithelium, the capillary endothelium, and their fused basement membranes.
Active transport
Filtration
Facilitated diffusion
Passive diffusion