"Nothing to offer but blood!" By Dr. Stanley Aronson. Dean of Med Emeritus Brown University

The first element of the inner human body cited in Genesis was Adam's rib.; second was the eye.: For when Eve and Adam ate the fruit  of the tree of knowledge, " THEN THE EYES OF BOTH WERE OPEN."  AND THE THIRD WAS BLOOD." when Cain slayed his brother, the  dietary laws of the Hebrews decree what:God says: "HARK, YOUR brother's BLOOD CRIES OUT FROM THE GROUND."  MANY TISSUES MIGHT HAVE CRIED OUT for reckoning- the heart, the brain, the spleen- Yet to the Hebrews the essence of the soul. and spirt of life rested solely in the blood. Blood was warm, pulsating, and when it was shed, life inevitably fled.
 Blood is the gift of life of the flesh and a solemn token of God's generosity. The Bible declares, " For the life of the flesh is in the blood." ( Leviticus 17:11). Repeatedly, Leviticus condemns any use of blood except in altar sacrifice.
 The Lord spoke" " Therefore I say to the Israelite people: no person  among you shall partake of blood.".
 Indeed, the dietary laws of the Hebrews decree that blood must be removed before the flesh of the bird or animal may be consumed.
James wanted the Christians to observe the same laws as applied to the Jews. but, St. Paul says: " Jesus. did not put a yoke around their necks, and he wouldn't either. When the dust settled, there were three requirements were for Christians: No fornication ( Sex outside of marriage), No eating food offered to Idols, and not eating anything strangled, for by doing so, you were eating the blood of the animal, which when you did, you were eating life; for life is in the blood. The animal was to be drained, before cooking.
 No culture is without it's dual taboos, and fascinations with blood.  Primitive hunters drank blood both of vanquished foes and the slain animals in the jungle. Blood of dying gladiators was fought over by spectators in the fervent belief that it would yield renewed strength and vigor. Blood was protective.  Moses instructed the beleaguered Israelites to a sacrificed a lamb and apply its blood to the lintels and door posts of their homes, for when the Lord goes through to smite the Egyptians, He will see the blood... and the Lord will pass over the door ( Exodus 12:23).
  A similar ritual was observed in the Moslem custom of slaughtering a Carmel and smearing its blood upon the lintels of homes to protect against evil spirits.
 Blood seals covenants, and binds contracts. In September 1492, Pope innocent lay dying; and in desperation his physicians  vainly elected to give him fresh blood taken from three orphan boys...
  The pope died, and the fate of the three boys is unknown!
 My input; Not the Drs.  " When you go to the "steak house" and order your "steak" and you have read this article,  I suggest you order it "well done", or you will never finish it, for the cows blood will call out!