Founded in 1956, USF is the fourth-largest public university in the state of Florida, with a total enrollment of 48,373 as of the 2014â2015 academic year. The USF system comprises three institutions: USF Tampa, USF St. Petersburg and USF Sarasota-Manatee. Each institution is separately accredited by the Commission on Colleges of the Southern Association of Colleges and Schools.
What lungs look like. Here is a diagram of the lungs. If you could see them, they would look pink and rubbery on the outside. Inside they look a lot like sponges. Air comes down the trachea (say trak-ee-a), or windpipe, into two large tubes called the bronchi (say bron-key).
Now think of your lungs as just empty, like balloons. You breathe in, your lungs expand, they draw in air, and the air interacts with the inside surface of the lungs to exchange oxygen and CO2. There's a certain amount of surface area there. You can't measure it very easily, but just get an idea of it in your head, if you opened up a pair of lungs and laid them out flat on a table, like cutting up a paper bag to lay it out flat.