Which of the following scenarios would be an example of diffusion?

The right answer is the third option (C).

- The pulmonary ventilation that allows the transfer of oxygen from the air that we breathe at the pulmonary alveoli

- Pulmonary diffusion that allows the passage of oxygen through the alveolar-capillary membrane of alveoli with red blood cells that are in pulmonary capillaries

- The circulation of red blood cells from the lungs to the tissues thanks to the heart

- The diffusion of oxygen from the blood which irrigates the tissues up to the cell

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