BIOLOGY 3 Lecture Notes - Lecture 19: Passive Smoking, Chronic Obstructive Pulmonary Disease, Bronchiole
Document Summary
Natural selection occurs because of differential survival and reproduction of individuals over time. For the human population as a whole to become resistant to this bacterium, nonresistant variants must die out of the population. Because a majority of nonresistant people aren"t even exposed to m. tb and this will continue to survive and reproduce, nonresistant variants will probably never be lost from the population. Future human evolution is not a likely solution to the problem of antibiotic-resistant superbugs. Environmental tobacco smoke (ets): secondhand smoke combined with smoke exhaled by active smokers: effects active smokers and nonsmoking people, similar to the smoke inhaled by active smokers but has some differences. Active smoker: holding and inhaling the cigarette. Passive smoker: nonsmoker in an environment high in ets. 4500 chemicals identified in tobacco smoke, may be as many as 100,000 in this mix. Passive smokers exposed to the same mix of chemicals as active smokers in much lower concentrations.
