It is used for the breaths in rescue breathing & CPR.
It is used to administer the breaths. It is more effective than mouth to mouth as it will provide air at 21% oxygen vs, 16% oxygen from air via the lungs.
It contains the volume of oxygen needed to supply the victim with rescue breaths of 100% oxygen.
To circulate oxygenated blood throughout the body to keep vital organs alive (heart, brain, liver, kidney's, etc).
Nothing unless you put something really heavy then it might tear.
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