Multiple Choice
Which of the following is NOT a function of the respiratory system?
A) Allowing carbon dioxide to leave the blood and enter the air.
B) Making speech and other sound possible.
C) Allowing saliva and other oral fluids to be swallowed.
D) Regulating the pH of the blood.
E) Protecting against foreign bodies and some microorganisms.
Correct Answer:

Verified
Correct Answer:
Verified
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