首页
登录
职称英语
Every year, 2,000 American lives are saved by the selflessness of others. T
Every year, 2,000 American lives are saved by the selflessness of others. T
游客
2024-10-23
38
管理
问题
Every year, 2,000 American lives are saved by the selflessness of others. These are the bone marrow donors who give the gift of life to patients fighting deadly diseases such as leukemia, lymphoma, and aplastic anemia. That’s the good news. The bad news is that thousands more die each year because not enough people have signed on to the registries that would help the ill find a suitable match for a transplant.
Bone marrow or stem-cell transplants are usually a last resort, intended for those whose illnesses have not responded to traditional treatments such as chemotherapy or radiation. How do they work? We all store a special type of cell in our bone marrow called stem cells. These primitive cells give rise to the three types of blood cells: red, white and platelets. Everyone’s stem cells have certain genetic characteristics or markers that make them unique from others. Despite this uniqueness, there are some shared characteristics between people. This is important, because a patient’s immune system will reject blood or organs received from someone else if they do not share sufficient similarities.
Family members, especially siblings, are always the first to be considered as donors, because there’s a greater chance that the genetic markers on their cells will have enough in common to prevent rejection after transplantation. In many cases, however, a familial match can’t be found and then the search begins for an unrelated donor. These donors typically come from a pool of people who have already signed up on a donor registry in the event that their cells match a needy recipient.
Once the lab has verified a match between donor and recipient, the next phase starts. The patient is given radiation or chemotherapy to kill the unhealthy cells. Healthy cells are harvested from the donor — either extracted from the pelvic bones or taken from the arm in a way that is similar to having blood drawn — and prepared in a laboratory. Once they’re ready, they’re given to the patient through a vein — the same way as one would receive a blood transfusion. Once these transplanted donor cells get settled within the patient’s bone marrow, they make the healthy red blood cells, white blood cells and platelets necessary to support life.
One of the major problems currently faced by transplant centers is that while bonemarrow transplants can cure more than 70 different diseases, there aren’t enough donors on the registry to treat the more than 3,000 patients awaiting transplants. The National Marrow Donor Program, the largest registry in the country, has approximately 4.8 million adult volunteer donors, but that isn’t nearly enough for the thousands who need transplants.
Why isn’t a pool of more than 4 million donors isn’t enough to cover 3,000 needy patients? Here’s the reason: in the vast-majority of cases, finding a suitable match isn’t easy. Because we are unique individuals with a variety of ancestral backgrounds and integration patterns, finding someone similar to us is a major task. In the end, it comes down to a numbers game — the more potential donors listed on the registry, the greater a chance of finding a match, especially for those with unusual genetic characteristics. [br] The author cited the example of g million volunteer donors in America to justify ______.
选项
A、all the patients will be able to get transplant treatment
B、there are more patients who need transplant
C、it becomes much easier to find suitable donors for the patients
D、it is hard to find suitable match even with the large pool of donors
答案
D
解析
推断题。文章最后两段提到,虽然全美骨髓捐赠者已登记在册近480万,却不能满足3000位病人的需要,原因是我们每个人都具有不同的遗传背景和综合类型,找到与自己相似的人真是大海捞针,可见D正确。
转载请注明原文地址:https://tihaiku.com/zcyy/3813360.html
相关试题推荐
BenjaminFranklinwasthegreatestearlyAmericanleadernevertobecomep
BenjaminFranklinwasthegreatestearlyAmericanleadernevertobecomep
BenjaminFranklinwasthegreatestearlyAmericanleadernevertobecomep
WhenItrytounderstand______thatpreventssomanyAmericansfrombeinghappy
Everyyear,2,000Americanlivesaresavedbytheselflessnessofothers.T
Everyyear,2,000Americanlivesaresavedbytheselflessnessofothers.T
Everyyear,2,000Americanlivesaresavedbytheselflessnessofothers.T
Wheredidtheconversationtakeplace?[br][originaltext]W:AmericanAirlines.
Americansbelievetimeisalimitedresource;theytrytoconserveandmana
Americansbelievetimeisalimitedresource;theytrytoconserveandmana
随机试题
TheAmericanAcademyofPediatrics(AAP)justreleaseditsupdatedguidelines
(1)Whatmakesagreatcommunicator?Awillingnesstosharethatdrivingsens
[originaltext]Goatsalwaysseemtobesecondbesttootherfarmanimals.T
阅读材料。根据所提供的条件进行教学设计。 水平四.初中二年级,八班,人数:38
根据《证券公司流动性风险管理指引》,下列关于流动性风险管理职责的说法,正确的是(
A.杞菊地黄丸合羚角钩藤汤 B.急用参附汤合苏合香丸,继用涤痰汤 C.茵陈术
2014年一季度世界粗钢总产量是多少万吨?() A.20270 B.35
下列关于中央军事委员会负责制的表述,正确的有( ) A.中央军事委员会对全国
2010年《选举法》修正案中涉及选举权平等性原则的内容有()A.选民所投的选票
(2017年真题)根据保险法律制度的规定,人寿保险的被保险人或者受益人自其知道或
最新回复
(
0
)