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biological

Judged: two independent readers; copy check clear.

brain death

brain death Brain death is a prolonged, irreversible stopping of all brain activity, including the lower brain stem.

Brain death is a prolonged, irreversible stopping of all brain activity, including the lower brain stem. It involves no voluntary movement, no response to stimulation, no brain stem reflexes, and no spontaneous breathing, after ruling out reversible conditions that can look similar.