Mouth-to-mouth respiration provides an oxygen concentration of:
16%
20%
22%
24%
A i.e. 16%Mouth - to mouth respiration provides 16% of 02.In mouth- to - mouth respiration the resuscitor takes a deep breath & exhales into the subject's mouth. It provides 16% (15.7%) of 02.(amount of 02 that is present in expired air)