What type of inhalation system allows for some exhaled gas to pass into surrounding air but some returns to the inspiratory part of the circuit for rebreathing?
a. Closed system
b. Semi-open system
c. Open system
d. Semi-closed system
ANS: B
With the semi-open system, exhaled gas can get into the surrounding OR air, but some is returned to the circuit for rebreathing.
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