Detailed biological illustration of oxygen diffusion from alveoli to capillaries, labeled Alveolus, Capillary, Oxygen diffusion, and Red blood cell.

A detailed biological illustration showing oxygen diffusion from the alveoli of the lungs into the surrounding blood capillaries. The alveoli appear as transparent air sacs surrounded by a dense network of tiny blood vessels. Small O₂ molecules are shown moving from inside the alveoli, across the thin membrane, into the red blood cells within the capillaries. The style should be clear, educational, and scientifically accurate, with semi-transparent tissues to show the movement of oxygen molecules. See more