why cannot we revive a dead person ?

Question

Once a person is dead is there no possibility to bring him back to life

Answer 1

Well, actually we can, sometimes... if they haven't been dead too long.
The old rule of thumb was that by 7 minutes without oxygen, the brain was so damaged as to be unrevivable. Now, however, we revive people who have drowned, especially in cold water, as much as 30 to 45 minutes after "death".
What constitutes "Death"? Traditionally, a lack of pulse and respiration. Today, lack of brain activity constitutes "brain death", even if the body is alive! It's a slippery concept, really.
Spiritually, I believe (belief here, not fact) that there is a non-physical component to the life-form, call it a soul for lack of a better term, which departs, and once severed from the corporeal body, doesn't return.
I used to work in a local hospital, and saw people die. Somehow you can always tell. Something just....goes. I've never seen anybody revived after that happens.
Best wishes, Arthur

Answer 2

Once tissue has deteriorated beyond a certain point, it cannot be repaired.
Irreversible damage can be caused by continual lack of oxygen. If it occurs to your finger, say, you will lose your finger, and survive without it, but you cannot repair your finger. If it occurs in the brain, or heart, then they cannot be repaired either, but the consequences are more severe. That is what you are trying to actually do in reviving a supposedly dead person, you are trying to infuse oxygen into the affected tissue, it may or may not be damaged beyond repair.
The system may also be rendered unrevivable by a drop in pH of the body. As toxins build up, say, from a failing liver or kidney, the pH of the body becomes more acidic, and chemical reactions are affected, including catalysts involved in breathing, and eventually breathing will stop. This pH drop is difficult to reverse with just CPR etc, unless the toxins are removed, so revival is not possible.

These are just simple explanations, but I hope they help.

Answer 3

It's actually possible to revive a dead person depending on how long the heart has stopped pumping. Defibrillator is often used in the emergency room to revive heartbeat. CPR can be also done if defibrillator is not available. Reviving a person who has been pronounced dead might be an ethical issue. Don't you think that our world is overpopulated already? Someone has to go sometime. That's the law of nature.

Answer 4

Because it isn't really science, it is philosophy or religion that defines what the "life force" is. Science, more precisely physics, deals with the study of the four fundamental forces in nature: the strong nuclear force, the electromagnetic force, the weak nuclear force and [the wimpiest of the four] gravity. Any other force you may think of can be derived into the interactions of one, some or all of these four. No one can scientifically quantify what constitutes the "life force". Physicists can tell you what atoms comprise everything in you, biologists can tell you how those atoms in the form of organs and tissues all work together while you are "alive", but neither can identify what it is that makes you or anything alive. So, this is where the philosophers step in and offer their explanations.
Anyway, since no one can identify and quantify and therefor store up or manipulate the life force, no one can give a deceased person a recharge of it. Some of the devout will say only God/Allah/Yahweh or whatever controls the "life force" of the universe. Me, I will stick with forces that are quantifiable.

Answer 5

Not to get all religious on you, but I think it's because life is more than the machinery of the body. It's not just a matter of getting all the parts to work right again. Life is something spiritual, and when God decides it's over, it's over. He allows us to learn more and more about how the parts work, and therefore we can keep the machine running in better form and for longer periods of time. But eventually he pulls the plug.

Answer 6

You can if the person's been dead for a very short time.

The brain needs oxygen to survive. If it is deprived of new oxygen, for too long, death cannot be reversed

Answer 7

well if their heart fails to pump then you can restart in within like 5 minutes but after that the brain wont get any oxygen so it'll just stop working which is the end of it all really.when the brain is dead, its all over.

Answer 8

well if it were possible then no one would be dead! i am sure by now if it were possible to revive someone,then SOMEONE would have figured it out!.

Answer 9

because humans need things for supporting thair life. oxygen, water, blood, and once the life supporting things are removed the body deteriorates and shuts down.and damage occurs once its shut down. and the damage is irreversible then we are put to pasture.

Answer 10

You have answered your own question, isn't it?

If he could be revived, he was not legally dead.