Diffusion is the process where an area of higher concentration naturally flows into an area of lower concentration. Upon inspiration of air into the lungs, the alveolar sac is full of oxygen and the surrounding tissue is saturated with carbon dioxide rich blood. Next, the process of diffusion allows oxygen to flow into the blood from the alveolar sacs and carbon dioxide to flow from the blood into the alveolar sacs where it will be released through exhalation.
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