首页
登录
职称英语
Salt is as necessary to life as water. In many areas of Africa people once d
Salt is as necessary to life as water. In many areas of Africa people once d
游客
2024-01-19
60
管理
问题
Salt is as necessary to life as water. In many areas of Africa people once drank the urine(尿)of animals because they had no other source of salt. Without salt, human beings die.
The human body demands that the amount of salt in the blood always stay the same. When the body does not get enough salt, it protects itself by letting less salt leave the body in urine and sweat. But it cannot reduce this output to zero. Some salt is always escaping. On a completely saltless diet, like that of some people in Africa, the body steadily loses small amounts of salt through the kidneys(肾)and sweat glands(腺). It then tries to adjust to this loss by speeding up its secretion(分泌)of water. In this way, the body attempts to keep the amount of salt in the blood at the necessary level. The result is a slow drying up of body and, finally, death. The person dies of thirst.
In cases where there is little or no water to drink, the body tries to do the opposite thing. Again, it must keep the salt level in the blood constant. Because it has little water, it attempts to stop water from leaving the body and to increase its secretion of salt. But, as with the escaping salt, it cannot be completely successful. Some water still leaves and the person eventually dies of thirst. In short, the body’ s normal needs for salt and for water are both parts of the same important need to keep the salt level in the blood constant. [br] In order to adjust to the loss of salt, the body______.
选项
A、loses some blood
B、speeds up its secretion of water
C、speeds up its secretion of salt
D、is drying up slowly
答案
B
解析
细节判断题。作者明确提出通过分泌水分而调节盐分缺少。
转载请注明原文地址:http://tihaiku.com/zcyy/3376673.html
相关试题推荐
[originaltext]Aresomepeoplebornclever,andothersbornstupid?Oristh
[originaltext]Manypeoplesufferfromsomeformofextremeanxiety.Someex
[originaltext]Approximately90%ofpeopleintheworldarenaturallyright-
Canyourememberwhatyouateyesterday?Ifasked,mostpeoplewillbeable
Canyourememberwhatyouateyesterday?Ifasked,mostpeoplewillbeable
Canyourememberwhatyouateyesterday?Ifasked,mostpeoplewillbeable
Canyourememberwhatyouateyesterday?Ifasked,mostpeoplewillbeable
[originaltext]Peoplespendalotoftimeusingphonesandcomputers.Mucho
[originaltext]Peoplespendalotoftimeusingphonesandcomputers.Mucho
A、Thewordsofsomebusinesspeoplearejustrubbish.B、Hewhoneverlearnsfrom
随机试题
Whatdoesthemansuggest?[br][originaltext]F:Wehaven’tgoneoutforabout
Asaninvestmentbankerspecializinginmergersandacquisitions,Francoisy
[originaltext]Eachyear,badfoodsickensaboutoneinsixAmericans.Propo
Atsometimeinyourlifeyoumayhaveastrongdesiretodosomethingstrang
各种运输方式内外部的各个方面的构成和联系,就是( )。 A.运输系统
信号检测论相对于经典心理物理学方法的优点是什么?
在固定资产贷款中,如果涉及境外借款担保项目,借款人还应提交外债指标的批文。
期货保证金存管银行由( )指定。A.期货公司 B.期货交易所 C.中国证监会
起重机械的位置限制与调整装置是用来限制机构在一定空间范围内运行的安全防护装置。下
某建筑企业与甲公司签订了一项总造价为1000万元的建造合同,建设期为2年。第1年
最新回复
(
0
)