almost done!

Ok folks, I'm a little late but I would like to talk to you, in brief, about the respiratory system. When we breathe in the diaphragm contacts, the lungs expand, and the ribs expand. The Alveoli expand too. The alveoli are •"any of the many tiny air sacs in the lungs where the exchange of oxygen and carbon dioxide takes place." In this gas exchange oxygen and carbon dioxide are exchanged. When a person is hypoxic: they need are so they hyperventilate. When a person is under water for long periods of time, they develop a condition called Nitrogen narcosis or "raptures of the deep." There is too much nitrogen in the blood and they need to slowly come back up to surface to allow time to decompress. When a person is also underwater they may develop something called decompression sickness or "the bends." This is the reason why it is hard to walk upright after coming out of the pool. All these conditions are cased by a change in atmospheric pressure. Have a great week!