Also, please remember that the timetables of death in many of the older books are bad guesses at best. Unless someone is going to do Nazi-type experiments of adrenalized, determined attackers and actually kill the test subjects, you'll never be able to get past the bad guess stage.
Everyone here has probably heard about the Miami Massacre or other famous instances of people who recieved injuries that should of been almost immediately fatal, but they fight on, maybe they live, maybe they die, but lots of times the guy getting shot/stabbed hasn't read the anatomy book or the ballistics tests.
As Hock has said at several seminars, some folks are just built a little different. There is an extremely rare condition where the heart is on the wrong side of the chest. Or maybe they have scar tissue, dense muscle, or that vein or nerve you are targeting ain't where the anatomy chart said it was. Maybe they have lots of blubber and your four inch knife doesn't even stab past it when you execute your number five thrust to the gut. Maybe you are facing some big boned good ol' boy and the .45ACP slugs you are shooting at him feel to him like .25ACP would to someone your own size...
A knowledge of anatomy though is a useful thing, for it will make you better at both healing and hurting. Get with a physical therapist, sports trainer, orthopedic surgeon and together with their knowledge and your own common sense experience, learn what MIGHT happen when the muscular-skeletal system is dynamically altered

. Get with a trauma surgeon, experienced combat Corpsman, Paramedics, etc. and pick their brains for annecdotal and clinical evidence of how fast bleedouts occur and the level of incapacitation from the injuries they have seen. Watch those horrendous Discovery Health channel programs where the subject is "World's most devestating injuries".
Dan