首页
登录
职称英语
What Is It? At the Center for Sickle-Cell Anemia in
What Is It? At the Center for Sickle-Cell Anemia in
游客
2023-12-09
31
管理
问题
What Is It?
At the Center for Sickle-Cell Anemia in Benin City, Nigeria, Tope’ s mother learned that sickle-cell anemia is a disorder of the blood. Contrary to superstitious beliefs, it has nothing to do with witchcraft or spirits of the dead. Children inherit sickle-cell anemia from both parents. It is not contagious. There is no way you can catch the disorder from another person. Either you are born with it or you are not. Tope’s mother also learned that while there is no cure, the symptoms can be treated.
Sickle-cell anemia occurs mostly in those of African. descent. Dr. I. U. Omoike, director of the Center for Sickle-Cell Anemia, told Awake !: "Nigeria has the largest black population of any nation and therefore has the largest number of sicklers of any nation. That makes this country the sickle-cell capital of the world." According to the Daily Times of Lagos, about one million Nigerians have sickle-cell anemia, and 60,000 die of it each year.
A Problem in the Blood
To understand the disorder, we need to know what blood does and how it moves through the body. An illustration helps. Imagine a country that depends on imported food to feed people living in rural villages. Trucks drive to the capital city where they are loaded with food. They leave the city along major highways, but as they enter the rural areas, the roads narrow.
If everything goes well, the trucks reach their destination, drop off their food, and then return to the city to collect more food for the next delivery. If many of the trucks break down, however, the food spoils and other trucks are blocked from passing. Then the people in the villages have little to eat.
In like manner, the red ceils in the blood travel to the lungs where they pick up a supply of oxygen-food for the body. They then leave the lungs and travel swiftly through major arteries to all parts of the body. Eventually, the "roads" become so small that the red cells can move only in single file through tiny blood vessels. It is there that they deposit their load of oxygen, which feeds the cells of the body.
A normal red blood cell is round like a coin-and moves through the smallest blood vessels quite easily. But in people who have sickle-cell anemia, the blood cells break down. They lose their round shape and take the form of a banana or a sickle — a farmer’s implement. These sickled blood cells get stuck in the small veins of the body, like a truck in the mud, blocking other red blood cells from passing. When the flow of blood to a part of the body is reduced, the oxygen supply is cut off and the result is a painful crisis.
A typical sickle-cell crisis results in cruciating pain in bones and joints. Crises are unpredictable; they can occur rarely as often as every month. When they do occur, they are distressing to both child and parent. Ihunde is a nurse Who works at the sickle-cell center. "It is not easy to manage a sickler child," she says. "I know, because my daughter has the disorder. The pain comes suddenly. She screams and cries, and I cry. Only after two or three days, maybe after a week, will the pain subside." [br] The terrible pain during a crisis is caused by______.
选项
A、the angular shape of the defective blood cells
B、the cutoff of oxygen supply in parts of the body
C、the cells stuck in the blood vessels
D、eating spoiled food
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3258291.html
相关试题推荐
Ifyouwanttoseewhatittakestosetupanentirelynewfinancialcenter
Ifyouwanttoseewhatittakestosetupanentirelynewfinancialcenter
Ifyouwanttoseewhatittakestosetupanentirelynewfinancialcenter
WhatIsIt?AttheCenterforSickle-CellAnemiain
WhatIsIt?AttheCenterforSickle-CellAnemiain
______isthecenterofBritishfinancingsystem.A、TheBankofEnglandB、TheBan
Thefitnessmovementthatbeganinthelate1960sandearly1970scenteredar
Thefitnessmovementthatbeganinthelate1960sandearly1970scenteredar
Theoppositionsupportersralliedinthecenterofthecapitalto[originaltext]
ConsiderationsofLearning-centeredTeachingI.IntroductionA.goal
随机试题
在动画制作中,一般帧速选择为()。A.90帧/秒 B.30帧/秒 C.120
A.有明厨明卫 B.卧室日照良好 C.每户有两个朝向 D.套内易形成穿堂风
轻混凝土的热膨胀系数小,遇火强度损失小,故特别适用于耐火等级要求高的高层建筑和工
用于重度顽固性高血压的药物()A:硝普钠 B:哌唑嗪 C:利血平 D:卡
与金融现货交易相比,金融期货的特征有()。 Ⅰ.交易对象不同 Ⅱ.交易目的不
操作中不许更改的关键字不包括()。 (A)拉;(B)退;(C)取
2020年,我国规模以上互联网和相关服务企业(以下简称互联网企业)业务收入128
人类赖以生存的环境包括自然环境和( )。 A.原生环境 B.社会环境
下列选项中不属于合理确定人工成本方法的是( )。A.劳动分配率基准法 B
关于刑法解释,下列哪些选项是错误的?()(2015年)A.《刑法》规定“以暴力
最新回复
(
0
)