The Respiratory System Breathe in… Breathe out… Good!
Functions • To bring in oxygen to the lungs/cells • To take away Co2 and wastes from cells/lungs • Ext. respiration-the exchange of oxygen/waste between the lungs and outside world • Int. respiration-the exchange of oxygen, Co2 and waste between the blood and cells
components • Lungs - 2 large, capillary lined sacks into which air is drawn. The capillaries absorb oxygen into the blood, where it is then delivered to all cells • Diaphragm - an involuntary muscle that controls breathing
The process of breathing • Inspiration - or inhalation/breathing in the diaphragm contracts (gets smaller) allowing for the ribs to open and the lungs to open, thereby pulling air in (a pressurized system) * Exhalation - or breathing out, the process is reversed: diaphragm relaxes, ribs and lungs close, forcing air out
Interesting Facts • You can live with only one lung, and often that lung will develop and get stronger • When you smoke ANYTHING, you are coating the lining of your lungs with tar and other substances that block/prevent oxygen from getting to the blood/body • Pneumonia - build up of fluid in the lungs, thereby prevent oxygen transfer • Lung Cancer - #1 cancer killer, 85% of lung cancer cases are related to smoking, either first hand or second hand smoke