All great points on this subject. I have a Conservative Jewish friend who told me that Jews are allowed to eat blood in emergency situations of starvation. He explained that under Jewish Law your life is more valuable to God than following the dietary code if it is between life and death as these scriptures you all have recounted verify.
Logically , it would follow that taking a blood transfusion to save your life in a medical emergency should fall into the same category even if you were attempting to follow the dietary prohibition. My Jewish friend also said that Jews do not consider blood transfusions to have anything to do with eating blood anyway.
As Mary has pointed out, it also never made sense to me that as a JW it is OK to eat any old meat from the grocery store with not a thought given as to how the animals were slaughtered. Most meat sold is not bled in accordance with Biblical Law unless it is Kosher. Why JWs will die before taking a blood transfusion (which has no Biblical mention) and yet would happily eat blood in unKoshered meat (which is directly mentioned) never made sense to me even as a 12 year old child. The JW blood policy would at least have some consistancy if JWs only ate Kosher slaughtered meat or slaughtered it themselves so as to verify that the animals were bled properly but they don't.
The JW policy is complete nonsense from every angle.
My Jewish friend says that the prohibition against eating blood has more to do with "humanely" slaughtering animals than it does with what we eat. Kosher slaughter entails using a very sharp knife which cuts the neck from ear to ear, one of the few places on the body where there are the least nerve endings combined with the most blood vessels so that the cut is as painless as possible. Bleeding to death is likened to falling asleep also lessening the pain of death for the animal. This also explains why animals without necks or easily visible blood were prohibited such as shell fish, crabs, lobsters, and most insects. He also said that waiting until all the blood is drained before cooking or eating the animal avoids cooking animals while still alive as was done in other cultures. Not eating milk with meat has similar roots since it is cruel to boil a calf in it's mother's milk.