Answer :
Most physicians define brain death as the cessation of function in the higher portion of the brain.
Because lower portions monitor things like heart rate, higher portions die first. The Most Important Brain Death Findings. - Coma or Unresponsiveness = no brain reaction in all extremities. - Absence of Brain Stem Reflexes = no cough, gag, corneal, pupillary, oculocephalic, or oculovestibular response.
The brain stem also carries information from the brain to the rest of the body, therefore it plays a crucial part in the brain's core activities such as consciousness, awareness, and movement. It is not feasible to remain awake after brain death.
Brain death is characterized by the loss of function of both the cerebrum, the "thinking" part of the brain, and the brainstem, the deep brain structure responsible for reflexes and respiration.
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