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Death is the termination of life in a living system, or in part thereof. It can be considered the opposite of birth.

Biologically, death can occur to wholes, to parts of wholes, or to both. For example, it is possible for individual cells and even organs to die, and yet for the organism as a whole to continue to live; many individual cells can live for only a short time, and so most of an organism's cells are continually dying and being replaced by new ones.

Conversely it is also possible for the organism to die and for cells and organs to live and to be used for transplantation. In the latter case, though, the still-living tissues must be removed and transplanted quickly or they too will soon die without the support of their host.

Irreversibility is often cited as a key feature of death and, indeed, scientists have not been able to watch a living organism die and later bring it back to life. Nonetheless, many people do not seem convinced that death is always and necessarily irreversible; thus some have a literal belief in the resurrection of Jesus Christ, while others have high hopes for the eventual prospects of Cryonics.

Motivations for and attempts at defining human death

By far the most important sort of death to most human beings is human death. Thinking about human death raises a number of questions.

First, how can we identify the exact moment at which death has occurred? This seems important, because identifying that moment would allow us to put the correct time on death certificates, make sure that the deceased's will is enacted only after the deceased is truly deceased, and in general guide us regarding when to act as one should act toward a living person and when to act as one should toward a dead person. In particular, identifying the moment of death is important in cases of organ transplant, as organs must be harvested as quickly as possible after death.

Historically, attempts to define the exact moment of death have been problematic. Death was once defined as the cessation of heartbeat and breathing, for example, but the development of CPR and early defibrillation posed a challenge: either the definition of death was incorrect, or techniques had been discovered that really allowed one to reverse death (because, in some cases, breathing and heartbeat can be restarted). Generally, the first option was chosen. (Today this definition of death is known as "clinical death".)

Today, where a definition of the moment of death is required, we usually turn to "brain death" or "biological death": people are considered dead when the electrical activity in their brain ceases. It is presumed that a stoppage of electrical activity indicates the end of consciousness. Those that view that only the neo-cortex of the brain is necessary for consciousness, however, sometimes argue that only electrical activity there should be considered when defining death. In most places the more conservative definition of death (cessation of electrical activity in the whole brain, as opposed to just in the neo-cortex) has been adopted (for example the Uniform Definition of Death Act in the United States).

Even in these cases, the determination of death can be difficult. EEGs can detect spurious electrical impulses when none exists, while there have been cases in which electrical activity in a living brain has been too low for EEGs to detect. Because of this, hospitals often have elaborate protocols for determining death involving EEGs at widely separated intervals.

It might also be worthwhile to entertain the possibility that death does not occur at a particular moment, but unfolds as a process over a period of time. Perhaps, in the end, it is not terribly meaningful to speak of "the exact moment of death".

What happens to humans after death?

Second, and more interesting to many, what, if anything, happens to humans when they die? Is there perhaps an afterlife? This is a long-standing and vexing question. For many, believe in an afterlife is a consolation in connection with death of a beloved one or the prospect of one's own death. On the other hand, fear of hell etc. may make death worse.

Physiological consequences of human death

For the human body, the physiological consequences of death include rigor mortis, algor mortis, livor mortis (dependent lividity) and decomposition (decay).

The deceased person is usually either cremated or deposited in a tomb, often a hole in the earth, called a grave. This happens during or after a funeral ceremony.

Graves are usually grouped together in a plot of land called a "cemetery" or a "graveyard" and are often arranged by a funeral home or undertaker.