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
59
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/2810375.html
相关试题推荐
[originaltext]Whenfarmersandwildanimalsshareland,conflictscanbeha
[originaltext]W:Wow!(9)Therearesomanychoices!ThereareanimalshereI’ve
It’swellknownthatbiganimals,likepolarbears,aresensitivetoclimate
It’swellknownthatbiganimals,likepolarbears,aresensitivetoclimate
It’swellknownthatbiganimals,likepolarbears,aresensitivetoclimate
It’swellknownthatbiganimals,likepolarbears,aresensitivetoclimate
It’swellknownthatbiganimals,likepolarbears,aresensitivetoclimate
Protestsattheuseofanimalsinresearchhavetakenanewandfearfulchar
Protestsattheuseofanimalsinresearchhavetakenanewandfearfulchar
Protestsattheuseofanimalsinresearchhavetakenanewandfearfulchar
随机试题
"Cool"isawordwithmanymeanings.Itstraditionalmeaningisusedto【C1】_
It____________(是很容易证明的)thatnothingismorepreciousthantime.canbeeasilyb
下列有关KAP模式的叙述正确的是()A.卫生保健知识和信息是改变健康行为的基础
局部应用杀灭疥虫的药物中,疗效最佳的是()A:苯甲酸苄酯 B:硫磺软膏 C:
女,63岁。乏力1年,双下肢肿胀、便秘3个月。查体:表情淡漠,心率52次/分,律
2016年第1季度,商业银行正常类贷款同比增长约()。A.8.4
王某于2011年4月将自住房出租给李某1年,年租金为5000元。2011年5月王
化学结构如下的药物为 A.环丙沙星 B.诺氟沙星 C.左氧氟沙星 D.氧
( )是房地产假定未设立法定优先受偿权下的价值减去法定优先受偿款后的价值。A.
劳动关系系统的运行的基本形式是( )。A.雇佣关系 B.冲突与合作 C.劳
最新回复
(
0
)