Question

Which of the following sequences is correct to initiate expiration? I. Relaxation of external intercostals muscles and return of diaphragm and sternum to their normal position

II. Air expelled from lungs

III. Volume of thorax decreases

IV. Intrapulmonary pressure increases

• A. I, III, IV, II
• B. II, IV, III, I
• C. IV, III, II, I
• D. I, II, III, IV

Answer 1

Answer: (A)

I, III, IV, II