A healthy blood oxygen level is 75–100 mm Hg, or 95–100%. Low blood oxygen levels, known as hypoxemia, may be a cause for concern. Your blood oxygen level is a measure of how much oxygen your red ...
Gases are exchanged across a specialized lung surface. The inhaled oxygen is diffused into the blood, and carbon dioxide from the blood is released into the lungs where it is exhaled. Gases are ...