Chapter 13, Problem 9AYK

Smoking cigarettes has been shown to be associated with the development of lung cancer. However, a direct correlation between how many cigarettes one smokes and the onset of lung cancer does not exist. A heavy smoker may not develop lung cancer, whereas a light smoker may develop the disease. Explain why this may be.

2. In the healthy individual in the upright position, the 1. V/Q ratio is highest in the lower lung regions 2. is lowest in the upper lung regions 3. V/Q ratio is lowest in the upper lung regions 4. is highest in the lower lung regions A. 1 only B. 2 only C. 4 only D. 3 and 4 only

Normally, the percentage of the total volume exhaled during an FEV1 by a 20-year-old individual is A. 60% B. 83% C. 94% D. 97%