then please take out the part about vital organs if it doesnt have any signifigance porpouse (im sure you can see how that would confuse some one).
-the thing about concuisness is that it can and cant be measured at the same time.it is reasonable to say that you and I have a counscious, but how does mine differ from yours and why. If i woke up one day with your counscious and you had mine could we be considered to have a counscious anymore since we arent aware of ourself anymore?
-is counscious measured in the extent of which are brain can percieve outside forces and stumuli......if some one cannot touch,feel,taste,see,hear is he still counscious?
-the thing about the heartbeat has so many flaws its almost impossible to hae as a rule of life. there are lifeforms that dont have hearts.there are humans that live without a natural heart that they were born with and on the same note its not the beating of the heart that keeps you alive its the flow of blood.
Sorry if it seems that I dont answer all your points one by one, I couldnt really understand all of them , English is not my native language

But then what makes us conscious beings? Without brain we are definitely not conscious, you sure know that even if we are asleep were conscious, even in coma,,,but when the brain becomes dead, its over, the body starts to decay. Ok I know that heart can be replaced by modern devices,and blood conyveys oxygen to brain etc, and heart stops when the sinus node cant do more electrical impulses (at least a friend of mine said something about it, he's a medic but maybe I misunderstood it, I'm not a biologist).So if you consider an organic material without consciousness a human living being, then a dead person could be considered as a human too. With conception, only the possibility of life is given. And what about insemination outside the womb? With modern medicine it can be done. And you consider that a human being too?