Scientists rethink why giant insects once ruled the skies, finding oxygen may not explain their size or disappearance.

Blood oxygen levels refer to the amount of oxygen circulating in the blood. Normal blood oxygen levels fall between 75 and 100 millimeters of mercury (mm Hg) on arterial blood gas (ABG) test results.

Tiger Iron formed when in the sea dissolved iron reacted with free oxygen produced by the first photosynthetic life forms on Earth. For the first 2 billion years of Earth's history, there was barely ...

Three-hundred-million years ago, Earth was very different. The continents had coalesced into Pangea, which was dominated in ...

Patients continuously monitored after surgery experienced significantly less time with dangerously low oxygen levels compared ...

First, pause and take a deep breath. When we breathe in, our lungs fill with oxygen, which is distributed to our red blood cells for transportation throughout our bodies. Our bodies need a lot of ...

Reducing oxygen levels in critically ill children on mechanical ventilators in intensive care could save tens of young lives each year, finds a new study led by researchers at UCL and Great Ormond ...

Last summer, in an unseasonal event, more than 100 miles of Florida’s coast around Tampa Bay became an oxygen-depleted dead zone littered with fish along the nearby shoreline. In the Northwest, ...