首页
登录
职称英语
Imagine an animal that becomes frozen in cold weather. Then, when it gets wa
Imagine an animal that becomes frozen in cold weather. Then, when it gets wa
游客
2023-07-05
74
管理
问题
Imagine an animal that becomes frozen in cold weather. Then, when it gets warmer, the animal simply unfreezes and goes back to its normal life. Although this may sound like something from a science-fiction movie, it is exactly what happens to the wood frog over winter and spring. When winter begins, the frog, which is found throughout much of Canada, buries itself in leaves and dirt. As the ground begins to freeze, so does the frog’ s body.
Normally, if a living creature is frozen, the cells inside its body are destroyed, leading to death. How, then, does the wood frog survive? The secret lies in the fact that although the water between the cells in the frog’ s body becomes frozen, the water inside the cells does not freeze. Before the winter begins, the frog stores starch in its body. As the weather gets colder, the drop in temperature causes the frog’ s body to change this starch into glucose. This glucose, in turn, lowers the temperature at which the liquid inside the frog’s cells freezes. As a result, the cells do not freeze even at very low temperatures, allowing the frog to stay alive. Some wood frogs stay in this frozen state— with their hearts stopped completely—for months without harm.
Now researchers are hoping to adapt the wood frog’ s secret to help them preserve human organs for transplants. Currently, after organs are removed from a donor’ s body, they are packed in a special liquid and kept very cold. However, they cannot be frozen because the ice would damage the cells in the organs. For this reason, the organs must be used quickly. If doctors had a way to preserve organs longer, they would have more time to find the best matches among people waiting for organ transplants.
There is still a lot about the wood frog that scientists do not understand. They still have to work out, for example, exactly how the frog is able to unfreeze itself and what actually restarts the frog’s heart when the weather becomes warmer. What is clear, however, is that lessons learned by studying this tiny creature could be of great benefit to humans in the near future. [br] Researchers are hoping to use the wood frog’ s secret to allow them to______.
选项
A、use transplant organs more quickly
B、remove organs from a donor more easily
C、unfreeze transplant organs with chemicals from the frogs
D、keep transplant organs longer than they can now
答案
D
解析
细节题。根据短文第三段前半部分help them preserve human organs fortransplants和最后If doctors had a way to preserve organs longer,可知选项D正确。
转载请注明原文地址:https://tihaiku.com/zcyy/2810740.html
相关试题推荐
Protestsattheuseofanimalsinresearchhavetakenanewandfearfulchar
Protestsattheuseofanimalsinresearchhavetakenanewandfearfulchar
WhatIfYouCouldLearnEverything?A)Imagineeverystudenthas
WhatIfYouCouldLearnEverything?A)Imagineeverystudenthas
WhatIfYouCouldLearnEverything?A)Imagineeverystudenthas
WhatIfYouCouldLearnEverything?A)Imagineeverystudenthas
WhatIfYouCouldLearnEverything?A)Imagineeverystudenthas
Protestsattheuseofanimalsinresearchhavetakenanewandfearfulchar
Protestsattheuseofanimalsinresearchhavetakenanewandfearfulchar
Protestsattheuseofanimalsinresearchhavetakenanewandfearfulchar
随机试题
Wheredoestheconversationprobablytakeplace?[originaltext]W:NowMr.Snow,
Ifyouareayoungcollegestudent,mostofyourconcernsaboutyourhealth
检验检测机构合同评审的结果之一,应该是()。A.检测报告 B.检定证书 C
根管预备过程中,出现根管阻塞的原因除外A.器械使用手法不当,将碎屑推向根尖导致阻
判断结核菌素试验为弱阳性,则皮肤硬结的直径为A.小于5mm B.5~9mm
24、电源电压不稳定,是产生零点漂移的主要因素。()
空气压缩机的()等应定期进行校验和检验。 A.压力表B.安
大型组织一般采用( )组织结构。A.直线制 B.职能制 C.直线职能制
甲超市为增值税一般纳税人,2020年3月从农业生产者处购入一批有机蔬菜开具
施工过程中可以作为工程量计量依据的资料有()。A.质量合格证书 B.《计
最新回复
(
0
)