How does oxygen get into the bloodstream?
Inside the air sacs, oxygen moves across paper-thin walls to tiny blood vessels called capillaries and into your blood. A protein called haemoglobin in the red blood cells then carries the oxygen around your body. At the same time, carbon dioxide that is dissolved in the blood comes out of the capillaries back into the air sacs, ready to be breathed out.
Blood with fresh oxygen is carried from your lungs to the left side of your heart, which pumps blood around your body through the arteries.
Blood without oxygen returns through the veins, to the right side of your heart. From there it is pumped to your lungs so that you can breathe out the carbon dioxide and breathe in more oxygen.
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What else do the lungs do?
On this page we explain the importance of your lungs, what can damage them and what you can do to protect your lungs.
Home oxygen therapy
If you’re living with a lung condition, you may be offered home oxygen therapy if your blood oxygen levels are persistently low. We’ve put this information together to explain what home oxygen therapy is, why it’s used as a treatment and who can benefit from using it.