You Are Instructing a Patient to Use a Wright Respirometer

Multiple Choice

You are instructing a patient to use a Wright respirometer to measure a vital capacity. Which of the following should you include in your instructions to your patient?
I. Blow slowly and gently when you exhale.
II. Inhale completely until your lungs are full.
III. Blow as hard and as fast as you can.
IV. Keep blowing until your lungs are completely empty.

A) I and II
B) II and III
C) I, II, and IV
D) II, III, and IV