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- Oct 13, 2013
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The heart valves do not inhibit travel of blood or blood clots or any other material. They just stop back flow. Very rare for blood clots from legs to only stop at the heart level. Actually good if it can stop at the heart - the heart can still function. There are conditions like atrial fibrillation where stagnant blood in one of the left heart chambers causes blood to clot but the clot does not cause any problem unless it dislodges and travels further to the brain.
Blood flow: veins - right atrium - valve- right ventricle-valve- pulmonary artery - lung - pulmonary vein- left atrium- valve- left ventricle- arteries to the rest of the body.
So the lung with its very tiny vessels can filter the blood of clots before the blood travels to the left side of the heart and to the brain. Rather get a blood clot in the lungs than in the brain. Although a blood clot from the leg big enough can cause complete cessation of blood flow and instant death due to complete blockage of the pulmonary arteries = Saddle Embolus.
Blood flow: veins - right atrium - valve- right ventricle-valve- pulmonary artery - lung - pulmonary vein- left atrium- valve- left ventricle- arteries to the rest of the body.
So the lung with its very tiny vessels can filter the blood of clots before the blood travels to the left side of the heart and to the brain. Rather get a blood clot in the lungs than in the brain. Although a blood clot from the leg big enough can cause complete cessation of blood flow and instant death due to complete blockage of the pulmonary arteries = Saddle Embolus.