Larger surface areaThin walls (facilitates easy diffusion)Good blood supply (oxygen in & carbon dioxide out)Must be moist (allows gases to dissolve for easy transport)
Reagents:-limewater, a clear, colorless solution turns cloudy/milky when carbon dioxide is present.- Hydrogen carbonate indicator changes color from red to yellow when carbon dioxide is present. Inhaled air, less carbon dioxide 0.04%- no change Exhaled air, more carbon dioxide 4%- change
Physical activity: e.g exercise, work- during exercise, the rate of breathing increase and becomes deep with intensity.---the more the exercise you do, the deeper you breath.How?:- rate & depth increases,heart pumps blood faster in order to:-supply oxygen & glucose to muscles-remove carbon dioxide from lungs at a faster rate.
Remove any accumulating lactic acid Reduce the oxygen debt
Smoking, inhalation and exhalation of the fumes of burning tobacco. Leaves of the tobacco plant are smoked in various ways. After a drying and curing process, they may be rolled into cigars or shredded for insertion into smoking pipes. Cigarettes, the most popular method of smoking, consist of finely shredded tobacco rolled in lightweight paper.
Tobacco consists of the following substances:-Nicotine-Tar-Carbon monoxideEffects of Nicotine-damages or narrows blood vessels-influence increased deposition of fat inside the arteries causing artherosclerosis