The work of the respiratory system can be divided into four parts. Which of the following is not one of these? A. Ventilation B.
Diffusion C. Excretion D. Perfusion
2 answers:
I would have to say that D) perfusion would NOT be one of the four parts of the respiratory system.
C. Excretion
Excretion is part of the excretory and really has nothing to do with the respitory system which deals with gas exchange.
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