If a machine breaks, you can fix it, even if it means replacing a part, and you can do this AFTER it’s stopped working. You can replace a part in a body to, like an organ, but only BEFORE the body stops working. Why is this? What do we lose when we die that cannot be replenished (except in the seconds/minutes after death in certain circumstances)?
In: Biology
You can not fix any machine. For example if something brakes in an engine so oil is no longer circulating this will destroy almost every component of the engine due to the rapid wear of dry components rubbing against each other and metal debris from the wear getting between components to cause even further wear. So if this happen you can not fix the engine but you might salvage some parts for use in other engines.
It is similar with humans. If the heart and lungs stop working then there is no longer any oxygen being transported to the cells and the cells start decomposing. This happens to every cell at once. Unless you are able to get the blood circulation up again to transport oxygen to the cells they will become damaged beyond repair after just a few minutes. You might just be able to save some organs but some of the more sensitive organs such as the brain is quickly beyond repair.
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