Blood oxygen levels help indicate lung health, as well as other conditions that happen in the body. Learn more about normal blood oxygen levels here.

Mountain adventures promise stunning views and unforgettable memories, but ascending to high elevations triggers profound ...

What happens when you hold your breath goes far beyond that quick dizzy spell. From plummeting oxygen levels to unexpected ...

The blood in your body delivers oxygen to all of your cells. When you breathe and draw fresh oxygen into your lungs, red blood cells bind with the oxygen and carry it through your bloodstream. On ...

Red blood cells (RBCs) play a central role in keeping your body energized and functioning. They carry oxygen from your lungs ...

A recent study shows that marine oxygen levels were crucial to the evolution of Early Paleozoic trilobite body size, suggesting that oxygen may have influenced the evolution of other animals&#39 ...

Every breath we take in contains 21% oxygen, the gas that makes life on Earth possible. Oxygen, in its combined oxide state, ...