How gases exchange in humans

The lungs are responsible for transferring oxygen to the blood and removing carbon dioxide from it. This is accomplished by millions of little air sacs called alveoli within the lungs.

Lungs alveoli gas exchange

Capillaries surround the alveoli, which are microscopic blood vessels. The air contains a higher concentration of oxygen than the blood, so oxygen diffuses from the air into the blood through the capillaries. Carbon dioxide diffuses the opposite way. A small tube called a bronchiole transports air between the alveoli and the outside world.

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