The absorption of oxygen and the elimination of carbon dioxide in the lungs take place by diffusion alone. There is no trustworthy evidence of any regulation of this process on the part of the organism.
August Krogh (1977). “Respiratory adaptations, capillary exchange, and reflex mechanisms: proceedings of the August Krogh Centenary Symposium held in Srinagar, Kashmir (India), October 11-15, 1974”
