Concentrators, which take oxygen from the air, are the least expensive.

Normal red blood cells move easily through blood vessels, taking oxygen to every part of your body.

Which gets us back where we started - it takes oxygen to stay alive.

They were protected by a device which took moisture and oxygen out of their hiding place.

The lungs take oxygen from the air and pass it into our bloodstream.

Our blood takes oxygen all around the body.

Algae, in turn, take oxygen from the lake, leading to its decay.

This expedition had taken bottled oxygen with them, but it was never used.

Exercise, such as walking, also increases your muscles' ability to take oxygen from the blood.

You should take enough oxygen to last the entire cruise.