Which sequence represents one respiratory cycle?
?
I. Inspiration, expiration
II. Inspiration, end-inspiration, expiration, and end-expiration
III. Expiration, end-expiration, inspiration, end-inspiration
IV. End-inspiration, inspiration, end-expiration, expiration
?
A. II only
B. IV only
C. 1 and III only
D. II and IV only
Answer: B
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