Question

What happens if oxygenated and deoxygenated blood mix together in heart ?

Answer 1

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Normally, the right side of the heart pumps blood to the lungs to get oxygen; the left side pumps the oxygen-rich blood to the rest of the body. A VSD allows oxygenated blood to mix with deoxygenated blood, causing the heart to work harder to provide enough oxygen to the body's tissues. ... There may be one or more VSD.

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Answer 2

If deoxygenated blood mixes with oxygenated blood, both lungs and tissues would receive blood with the same amounts of oxygen, which would affect the efficiency of the delivery of O2 to the tissues of the body.