人进入老年,一切生理功能都在衰退,包括大脑在内。老年人脑血流量减少,氧气摄入量减少,神经细胞皱缩,神经纤维再生能力减弱,从而导致大脑功能的退化和精神活动的衰退。老年人的记忆力,尤其是近事记忆很差,昨天还在用的东西,今天已回忆不起放在哪里。刚对人作过的许诺,转身就忘得一干二净。刚对小辈 People into old age, all physiological functions are in decline, including the brain. Elderly cerebral blood flow decreased, reduced oxygen intake, nerve cell shrinkage, decreased ability of nerve fiber regeneration, resulting in the deterioration of brain function and mental activity decline. The memory of the elderly, especially the recent memory is poor, what is still in use yesterday, can not recall where today. Just made a promise to people, turn around forget forgotten. Just to junior