Which of the following statements are true of FEV₁?
I.The FEV₁ decreases approximately 30 mL per year after the age of 25 years.
II.Habitual physical exercise and high aerobic capacity slow the normal deterioration in lung function.
III.Cigarette smoking accelerates the deterioration of lung function.
IV.Smoking cessation normalizes lung function.

Question

Quizplus · Accepted Answer

The volume expired in the first second of the forced vital capacity (the forced expiratory volume [FEV₁]) decreases approximately 30 mL per year after the age of 25 years. Apparently, habitual physical exercise and high aerobic capacity do not slow this normal deterioration of lung function; on the other hand, cigarette smoking accelerates it. Smoking cessation, however, brings the rate of FEV₁ decline to a level closer to normal.

Which of the Following Statements Are True of FEV1

Which of the Following Statements Are True of FEV₁