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Dec 25, 2012 at 22:46 history edited Menachem CC BY-SA 3.0
arteries
Dec 25, 2012 at 19:36 vote accept Shaul Behr
Dec 25, 2012 at 19:36 comment added Shaul Behr For the record, the Rosh defines "blood that moved" specifically as having left the meat altogether; he seems to be your primary source for your paragraph beginning "There are opinions..."
Dec 25, 2012 at 19:01 comment added Menachem @DoubleAA: The term the Tur uses is 'the strings that have blood in them, since the blood in the strings are as if gathered and standing in a vessel'. If I had to guess, I'd say that all the tubes (veins, arteries) that are still recognizable as such are forbidden, but ones that do not have recognizable tubes are permitted. According to wikipedia en.wikipedia.org/wiki/Capillary the walls of the capillaries are just one cell thick. Hardly recognizable as tubes.
Dec 25, 2012 at 18:51 comment added Double AA Since the question is specifically about science, I'm going to press you further. What do you mean veins? Is that to exclude arteries? If so, why? If not, then wouldn't all capillaries fit in as well? Blood is always in a vein, artery or capillarity (when not inside the heart/lungs/liver/kidney). What does 'in the meat' mean scientifically?
Dec 25, 2012 at 18:47 history edited Menachem CC BY-SA 3.0
changed to veins
Dec 25, 2012 at 18:43 comment added Double AA Per science, blood is always in the circulatory system, just in narrow and narrower tubes.
Dec 25, 2012 at 18:08 history answered Menachem CC BY-SA 3.0