Healthy Bodies

General purpose of this lecture is to present on Healthy Bodies. By this lecture you now where your lungs and windpipe are; know that in the lungs,oxygen from the air enters the blood and know that in the lungs,carbon dioxide leaves the blood and gets breathed out. You also able to name the harmful substances in tobacco smoke and able to measure the amount of tar in cigarette smoke. Finally explain something about the diseases connected with smoking and describe some of the other substances which can pollute our lungs.