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Inside the alveoli, oxygen moves across paper-thin walls to the capillaries (tiny blood vessels) and into the blood. It is then picked up by chemicals (haemoglobin) in the red blood cells that carry it around the body. At the same time, waste products from the body, in the form of carbon dioxide, come out of the capillaries back into the alveoli, ready to be breathed out. Freshly oxygenated blood is carried from the lungs to the left side of the heart which pumps blood around the body through the arteries. Once the oxygen has been used up, the blood returns, through the veins, to the right side of the heart. From there it is pumped to the lungs so that the carbon dioxide can be removed and more oxygen taken on board.

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What if oxygen-rich blood mixes with your oxygen-poor blood?

the quality of our blood that rich with oxygen will become low


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The oxygen poor blood (not enough oxygen) goes to the lungs to get more oxygen to turn into oxygen rich blood (has plenty of oxygen)


Why is it important for your heart to separate oxygen rich blood from oxygen poor blood?

If the oxygen-rich blood and the oxygen poor blood mix the amount of oxygen becomes diluted. The cells and tissues need more oxygen than they will get.


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oxygen is the answer


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no you have oxygen high blood.


How is oxygen transferred to the blood?

oxygen is transferred to the blood by breathing


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What color is oxygen-poor blood?

Oxygen-poor blood is dark red; oxygen-rich blood is bright red.


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