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Moment The Brain Stops: And what of the definition of death itself? The use of organs from cadavers depends upon the fact that each Tissue dies at a different rate. If we assume that death occurs at the moment the brain stops functioning, many organs are available in an intact state for transplantation. If, however, we say that death occurs when spontaneous heart action has ceased, when reflexes are absent, and when there is no respiration, then some organs have also died or have been irreparably damaged. To avoid this, there is much pressure toward a new definition of death dependent upon brain, not heart, activity.
Strong and effective rudder stops are to be fitted. Where adequate positive stops are provided within the gear, structural stops will not be required. See also 5.15.7.See Also Brain Of Cats:The fact that direct electrical stimulation of the anterior pituitary does not induce secretions led Harris to search for a further link in the con¬trol mechanism. He suggested that the hypo¬thalamus liberates humoral agents into the hypophyseal portal system (a blood vessel system in the pituitary stalk)—an idea later substan¬tiated in many laboratories. After these demon¬strations of nervous control of hormonal secre¬tions, Harris investigated hormonal control of nervous activity. Implanting fragments of solidi¬fied hormone into the brain of cats, he located brain areas that regulate sexual behavior.
Among the most interesting developments in brain studies was a finding that corrected the long-held conviction that glucose was the only fuel the brain was capable of using. George Cahill studied brain metabolism in persons who fasted for more than 30 days as part of a weight reduction program. By sampling blood entering and leaving the head, he was able to show that during fasting the brain will readily metabo¬lize fatty acids, the breakdown products from deposits of body fat. Careful intelligence tests before and after the fast failed to show any mental impairment during the period of fasting. Cahill said that in fact the subjects were at least as sharp after fasting, and maybe a bit sharper.
On The Other Hand See Functioning Brain:1. If new medical techniques can prolong a healthy life far beyond the present span, who will be selected to remain alive? Society, through law, probably will not leave it to the workings of the marketplace or the caprice of physicians. At the very least, it will try to prevent a black market in hearts and lungs. But if science manages to transplant a human brain, the law will be in serious trouble. Which individual will be con¬sidered legally "alive"—the one into whose functioning body the new brain has been deposited, or the one whose brain with all its memories has merely moved to a new home?
2. If the right to live is expanded, what of the right to die? At present the law recognizes no such right, neither for those new¬born who will never have a functioning brain, nor for the aged who have lost it. Euthanasia and suicide are crimes now, but perhaps science will one day be able to prove that in an over¬crowded world both acts are rational—whereupon the law will concede the right to die. |
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