A system for facilitating emergence of a subject from inhaled anesthesia is disclosed, wherein the system comprises: a filter for at least partially removing anesthesia from gases exhaled by the subject a CO2 level-elevating component for causing the subject to inhale gases including an above-normal amount of CO2 anda selective restrictor, which comprises a bypass conduit and a pair of valves, at least one valve of the pair of valves being positioned at an end of the bypass conduit or along a length of the bypass conduit, for causing: exhaled gases to bypass the filter and enter the CO2 level-elevating component andinhaled gases to be drawn from the CO2 level-elevating component and through the filter.
