Where is blood gas exchange?

Blood gas exchange primarily occurs in the alveoli of the lungs, where oxygen from inhaled air diffuses into the blood while carbon dioxide diffuses out of the blood to be exhaled. This process is facilitated by the thin walls of the alveoli and surrounding capillaries, allowing for efficient gas exchange. Additionally, gas exchange occurs at the tissue level, where oxygen is delivered to cells and carbon dioxide is collected for transport back to the lungs.