Tiny, delicate air sacs deep within the lungs, where the gas/blood exchange occurs. Oxygen from inhaled air passes through the walls of aveoli and enters the bloodstream while carbon dioxide passes out in the same way when air is exhaled.

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.