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<DIV>In the daf yomi Sabbos 31b, R. Chisda states “omar HKB”H revi’is dam
nosati bochem” and Rashi explains that man’s life depends on it. In fact (the
typical ) man has about 5 liters of blood (varies with the size of the
individual). This is a lot more than one revi’is of dam. Nor is it possible for
this to means that if you lose blood, you can still survive on one revi’is dam.
I believe that is not the case either. From a quick google, after about 40%
blood loss you go into coma and without immediate help (transfusion) will not
survive long.</DIV>
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<DIV>There is a similar gm’ in Sota 5a brings R. Alaksandri who in his maimre
says, “adam shain bo elo revi’is achas (some are goreis dam), and in agreement
with our gm’ in Shabbos. Tos there brings a R’Channanel (if I understand it
correctly) that what the gm’ means is that a revi’is is just the volume of blood
in the heart. How do you understand these gemaras, and why is this revi’is more
significant than the rest of one’s blood given that with only the revi’is in the
heart alone you certainly can not survive.</DIV>
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<DIV>Kol tuv</DIV>
<DIV>Chaim Manaster</DIV>
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