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Beheading is effective and is probably as humane as any other modern method if carried out correctly. When a single blow is sufficient to decapitate the prisoner, they lose consciousness within a few seconds. They die from shock and anoxia due to haemorrhage and loss of blood pressure within less than 60 seconds. However, because the muscles and vertebrae of the neck are tough, decapitation may require more than one blow. Death occurs due to separation of the brain and spinal cord, after the transection (cutting through) of the surrounding tissues. Consciousness is probably lost within 2-3 seconds, due to a rapid fall of the "intracranial perfusion of blood" (blood supply to the brain).

It has often been reported that the eyes and mouths of people beheaded have shown signs of movement. It has been calculated that the human brain has enough oxygen stored for metabolism to persist about 7 seconds after the head is cut off.

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