Respiration is activated by changing pressure within the thorax. _____ is a(n) ____ process, and _____ is a(n) _______ process.
A. Exhalation; active; inhalation; passive
B. Inhalation; active; exhalation; passive
C. Exhalation; active; inhalation; voluntary
D. Inhalation; passive; exhalation; involuntary
Answer: B