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A: Small amounts of air often get into the blood circulation accidentally during surgery and other medical procedures (for example a bubble entering an intravenous fluid line), but most of these air emboli enter the veins and are stopped at the lungs, and thus a venous air embolism that shows any symptoms is very rare.[citation needed]

For venous air embolisms, death may occur if a large bubble of gas becomes lodged in the heart, stopping blood from flowing from the right ventricle to the lungs (this is similar to vapor lock in engine fuel systems).[citation needed] However, experiments in animals show that the amount of gas necessary for this to happen is quite variable, and also depends on several other factors, such as body position.[citation needed] Very large and symptomatic amounts of venous air emboli may also occur in rapid decompression in severe diving or decompression accidents, where they may interfere with circulation in the lungs and result in a choking sensation or hypoxia.[citation needed] (borrowed from Wikipedia)

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Q: How come if air gets in you veins it can kill you?
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