![]() ![]() Here, oxygen from the air we breathe in diffuses through the alveolar walls into the bloodstream, while carbon dioxide-a waste product of cellular respiration-moves in the opposite direction, from the blood to the alveoli, to be exhaled. ![]() In humans, the primary site for gas exchange is the alveoli, tiny air sacs within the lungs. ![]() Gas exchange is the biological process by which gases are transferred between an organism and its environment. Understanding the mechanics, regulation, and pathophysiology of gas exchange is essential for clinicians, researchers, and even laypeople, as it has direct implications for conditions like asthma, chronic obstructive pulmonary disease (COPD), and various forms of respiratory failure. This process is not only vital for sustaining life, but its efficiency can also be a critical indicator of respiratory health. Gas exchange is a fundamental physiological process that occurs in the lungs, enabling the human body to obtain the oxygen it needs for cellular functions and to expel carbon dioxide, a waste product of metabolism. ![]()
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