Clinical death is not the end for all mechanisms in the human body. Some parts keep firing shortly after we die.
The immediate aftermath of dying can be surprisingly lively. For the first few minutes of the postmortem period, brain cells may survive. The heart can keep beating without its blood supply. A healthy liver continues breaking down alcohol. And if a technician strikes your thigh above the kneecap, your leg likely kicks, just as it did at your last reflex test with a physician.
Without your brain, breathing stops and so does blood pressure regulation. Still, the heart and GI system have their own independent pacemakers, which both keep ticking for a time. These, in turn, let liver and kidney operations continue for a brief period before the organs are starved for blood. From death for one person, then, may come life-saving opportunities for others.
Very quickly, however, inside the tight box of your skull, the brain cells that constituted your thoughts and memories start to swell without access to their blood supply. When pressure above or below breaches and destroys the brain stem, all possible activity ceases. Braindead patients awaiting transplant surgery can show a physiological motor response more than 24 hours after death, which sometimes surprises and scares even doctors. The rarest and most famous of such responses is the “Lazarus sign,” when someone’s arms rise briefly and then drop crossed on the chest.
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