MadSci Network: Medicine |
how can blood flow back to the heart through the veins when someone is sitting down or sleeping in bed, if there is no muscle contraction? the heart doesn't suck the blood back in. If it did, then the veins would have equal blood pressure to the arteries. the veins rely on muscle movements in order for the blood to flow back to the heart. if there is no muscle contraction, then the blood would technically swell up in a person's legs and feet, and the heart would therefore get less and less blood back. so how do the veins return the blood to the heart if a person is sleeping and are not really moving their legs or their arms while they are sleeping? or let's say a person is standing still. how do the veins get the blood back to the heart against gravity? thanks for your help.
Re: how can blood flow back to the heart through the veins when someone is sitt
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