The baby needs extra oxygen for at least 28 days after birth.

They were enough to send me on my way without using any extra oxygen.

There is not much you can do for some people, give extra oxygen and help them walk.

But the extra oxygen he needed affected his eyes, leaving him nearly blind.

No extra oxygen there, but still it was sitting down, and hardly any demands on the body.

If the extra oxygen taken in is not needed by the muscles for running away or fighting, the effects can be dramatic.

Perhaps a trace of extra oxygen but otherwise completely normal.

Each carried extra oxygen and a communicator to call for help.

I use a machine that provides extra oxygen for me to breathe.

Most buildings exchange air with the outside several times a day, so that any extra oxygen would be lost continuously.