Sunday, October 18, 2009
Did you know?
Your lungs start with your trachea, then they branch into two primary bronchi, then they keep branching and branching until they end up in these minute little air sacs of capillary thinness called alveoli. It is here that all the key exchanges take place (oxygen, carbon dioxide, etc.). The way they're stuffed into your lungs is incredible.
If you stretched out all the surface area of all your alveoli flat, it would cover the square footage of a tennis court.
Posted by Trina at 2:49 PM