What would happen if oxygenagted blood and deoxygenated blood mixed?

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theheart789
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if it wasnt for the septum theyd mix what are the results of that?
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Chlorophile
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(Original post by theheart789)
if it wasnt for the septum theyd mix what are the results of that?
Not a biologist in any shape or form, but I think I've heard of a condition where a hole in the heart allows oxygenated and de-oxygenated blood mixes. As you'd expect, this massively reduces the efficiency of the pumping system since already oxygenated blood is pumped to the lungs so less blood is actually getting oxygenated, so I'd assume you'd have similar symptoms to anaemia.
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Dynamo123
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(Original post by theheart789)
if it wasnt for the septum theyd mix what are the results of that?
Well, if oxygenated and deoxygenated bloods get mixed, it will reduce the overall efficiency of blood to carry oxygen to the tissues. How it does so is interesting. If for instance, there is a ventricular septal defect in a person, the oxygenated blood will go to the right side due to the higher pressure in the left ventricle, and from there, pass through the whole process of pulmonary circulation once again. Obviously since this is increasing the oxygenated blood, so there won't be any problems. But after a while, the pulmonary resistance will increase, and if it becomes greater than the systemic circulation, it will cause blood flow from the right to the left ventricles. Now deoxygenated blood is mixing in large amounts with oxygenated blood, which is being delivered to the systemic circulation. This is what will decrease O2 carrying efficiency and cause cyanosis.
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