Which of the following conditions is NOT the characteristic of the early stage of emphysema?
a. Diffusion impairment
b. Merge of alveoli
c. Enlargement of alveoli
d. Increases the total surface area in the lungs for gas exchange
e. Destruction of lung tissue
16. Which of the following conditions about chronic obstructive pulmonary disease (COPD) is/are correct?
I. The FEV1 is less than healthy individuals
II. Excessive mucus in the airway
III. The FEV1/FVC ratio is >0.8
b. II only
c. I only
d. I and II only
e.I, II and III
17. Which of the following conditions leads to respiratory acidosis?
Lactic acid accumulation
d. At the early stage of pulmonary edema
e. Diffusion impairment
18. Which of the following conditions may lead to metabolic acidosis?
I. Untreated diabetes
III. Fasting for 3 days
a. I and II only
b. I only
c. II only
d. I, II and III
e. II and III only