What happens when oxygenated and deoxygenated blood mixes?
Answers
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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Generally, it occurs when there's a ventricular septal defect (a hole between the two ventricles) that causes the poorly oxygenated and well oxygenated blood to mix. It results in blood circulating in the arteries to be less oxygenated than it should. It really depends on how poorly oxygenated the blood is overall, but it can result in life threating conditions because of an inability to provide enough oxygen to all the tissues of the body.
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