Which Statement About the Respiratory System and Oxygen Needs Is

Multiple Choice

Which statement about the respiratory system and oxygen needs is correct?

A) To meet oxygen needs,respiratory structures must be intact by the time they are 2 years old.
B) To meet oxygen needs,alveoli must exchange O2 and CO2.
C) To meet oxygen needs,the airway must be open 50% of the time.
D) To meet oxygen needs,oxygen therapy is needed.