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Before blood returns to the left atrium, it is collecting oxygen from the lungs. While in the lungs it is releasing carbon dioxide to be exhaled.

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Q: What happens to the blood before it returns to the left artuims of the heart?
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What happens to the blood before it returns to the left atrium of the heart?

Blood becomes oxygenated in the lungs, then the oxygenated blood goes to the heart via the pulmonary veins and enters the left atrium

What happens to the purified blood after it is filterd?

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The blood vessel that returns oxygenated blood from the placenta to the fetus is the?

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What color is blood when it returns to the heart?

Blood is bright red when it returns to the heart from the lungs. It is darker red when it returns to the right atrium from the systemic circulation.