Every animal sleeps, but the reason for this has remained foggy. When lab rats are not allowed to sleep, they die within a month. 71.________
One idea is that sleep helps us strengthen new memories. 72.________ We
know that, while awake, fresh memories are recorded by reinforcing (加强) connections between brain cells, but the memory processes that take place while we sleep have been unclear.
Support is growing for a theory that sleep evolved so that connections between neurons(神经元) in the brain can be weakened overnight, making room for fresh memories to form the next day.
73.________ Now we have the most direct evidence yet that he is right. 74.________ The synapses in the mice taken at the end of a period of sleep were 18 per cent smaller than those taken before sleep, showing that the connections between neurons weaken while sleeping.
If Tononi’s theory is right, it would explain why, when we miss a night`s, we find it harder the next day to concentrate and learn new information — our brains may have smaller room for new experiences.
Their research also suggests how we may build lasting memories over time even though the synapses become thinner. The team discovered that some synapses seem to be protected and stayed the same size. 75.________ “You keep what matters,” Tononi says.
A. We should also try to sleep well the night before.
【高考北京卷英语试题(Word版含答案)】相关文章:
★ 甘肃省张掖市高台县第一中学2016-2017学年高一上学期期末考试英语试题Word版含答案
★ 湖北省黄冈市2016-2017学年高一上学期期末考试英语试题 扫描版含答案
★ 河北省隆化存瑞中学高一上学期第三次联考英语试题(无答案)
★ 广东省中山市华侨中学2016-2017学年高一上学期第二次段考英语试题 Word版含答案
★ 重庆复旦中学2014-2015学年高一上学期期中考试试卷 英语 Word版含答案
★ 吉林省长春市十一中学2017-2017学年高一上学期期中考试英语试题(Word版含答案)
★ 重庆市杨家坪中学2017-2017学年高一上学期期中考试英语试题 Word版含答案
最新
2019-11-15
2019-11-15
2019-11-14
2019-11-14
2019-11-11
2019-11-11