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
29
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:https://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
Thediscoverythat,frictionexcluded,allbodiesfallatthesamerateissosi
Ifyouwanttoseewhatittakestosetupanentirelynewfinancialcenter
A.A B.B C.C D.D E.E儿科病房()
患儿男,10个月,体重9kg。腹痛,哭闹不安伴腹泻、呕吐3天,发热1天。头两天腹
胆道出血的特点是A、既往无溃疡史,而有应激因素存在 B、来势凶猛,出血量大
速度v、压强p、密度ρ的无量纲集合是:A.ρp/v B.pv2/ρ C.
期门穴的位置是( ) A.锁骨中线上,当第5肋间隙处 B.锁骨中线上,当第
符合资本化条件的资产在购建或者生产过程中发生非正常中断、且中断时间连续超过3
平屋面的涂膜防水构造有正置式和倒置式之分,所谓倒置式指的是()。A.隔热保
关于工程量清单招标方式下投标人报价的说法,正确的是()。A.专业工程暂估价
最新回复
(
0
)