Beginning of Essay
We as humans need a way to gather oxygen from our enviroment to survive. In response our body has a system that carries out respiration which is the distrubition of oxygen to the blood and the disposal of the waste product carbon dioxide. In the human breathing p ....

Middle of Essay
.... which is a speration of the trachea into the two different lungs it is used to carry oxygen to different parts of the body. These bronchus break into many bronchioles which then branch into many many microscopic tubs that cary the oxygen to every part of the lung till they meet the thin sacs called aveoli. Aveoli are thin sacs in the lungs that carry oxygen in and carbon dioxide out of the blood stream. They diffuse the oxygen into the blood cells that need it and in turn diffuse carbon dixoxide out. Diffusion is an easy method for the transfer of oxygen because it dosent take any energy and since the walls of the aveoli are only 1 cell thick it ....