Respiratory System The respiratory system is the system of the body that deals with breathing. When we breathe, the body takes in the oxygen that it needs and removes the carbon dioxide that it doesn't need. First the body breathes in the air which is sucked through the nose or mouth and down through the trachea (windpipe). The trachea is a pipe shaped by rings of cartilage. It divides into two tubes called bronchi. These …showed first 75 words of 400 total…

…showed last 75 words of 400 total…surface area of the lungs is roughly the same size as a tennis court.  The capillaries in the lungs would extend 1,600 kilometres if placed end to end.  We lose half a litre of water a day through breathing. This is the water vapour we see when we breathe onto glass.  A person at rest usually breathes between 12 and 15 times a minute.  The breathing rate is faster in children and women than in men. ------------------------------------------------------------------------ **Bibliography**