Diffusion allows gases to move into and out of the alveoli of the lungs due to difference in concentration of oxygen gas in red blood cell and alveoli.
What is diffusion?
Diffusion is the movement of gas particles from the region or area of higher concentration to the region of lower concentration.
The alveoli contains high concentration of oxygen molecules (O2) while the red blood cell contains low concentration of oxygen molecules (O2), this enables the oxygen to diffuse into the red blood cell, due to its lower concentration of oxygen.
Learn more about diffusion here: https://brainly.com/question/94094
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