首页
登录
职称英语
It is an everyday observation that animals are born, grow, and mature then b
It is an everyday observation that animals are born, grow, and mature then b
游客
2024-05-04
49
管理
问题
It is an everyday observation that animals are born, grow, and mature then begin to lose some of their capabilities, and finally die. This loss of capabilities is progressive, irreversible, and common for all members of a species and is called aging. In humans it shows in many ways, some very visible: decline in height, shrinkage of muscle, thinning and graying of hair, and wrinkling of skin. Internally, and even more significantly, there is the progressive loss of cells in the brain, kidneys, and other vital organs. This cell loss has resulted in stoppage of a vital process. Whatever the reason, important tissues ranging from the muscles to the brain shrink and become less competent with age. Many of these changes are reflected in functional declines. Not only do nerve cells at levels from the brain to the spinal cord(脊髓)diminish, but also those that remain conduct impulses at a slower rate so that the reaction time of older animal is slowed. Memory often shows a decline.
Another widespread decline is in the loss of cells involved in the hearing process. The loss is most marked for high pitches and may require the assistance of a battery-operated hearing aid. More subtle are such declines as those in the processes involved with being immune to disease, which result in a lessened ability of the older organism to cope with infection. Indeed, pneumonia(肺炎)is one of the most common causes of death among the elderly population of most nations.
Mixed with true aging processes are disease processes that may be so common as to be mistaken for aging. For instance, the buildup of deposits of fatty materials in arteries tends to be progressive with aging; everything else being equal, the narrowing of arteries results in such serious illnesses as stroke or heart attack, occurring with increasing frequency as an individual ages.
It is now recognized that atherosclerosis(动脉硬化症)is the result of many factors, not only genetic but also environmental high blood pressure, high saturated-fat diets, and smoking, the effects of which become more obvious with the passage of time. It is therefore an age-related, but not a universal aging process and can thus usually be controlled. [br] The buildup of deposits of fatty materials in arteries is a______process.
选项
答案
disease
解析
第三段中讲到“动脉中的油脂沉淀物”的情况。本段的主题是一些生病过程与老化过程混在一起的情形。然后就举了“动脉中的油脂沉淀物”的例子,说这种情况会加速老化的过程。可见它是一个生病过程。
转载请注明原文地址:https://tihaiku.com/zcyy/3583543.html
相关试题推荐
Usinganimalsincircusesisanunnecessaryandinhumanepracticethat’shar
Usinganimalsincircusesisanunnecessaryandinhumanepracticethat’shar
Usinganimalsincircusesisanunnecessaryandinhumanepracticethat’shar
Usinganimalsincircusesisanunnecessaryandinhumanepracticethat’shar
Usinganimalsincircusesisanunnecessaryandinhumanepracticethat’shar
Usinganimalsincircusesisanunnecessaryandinhumanepracticethat’shar
SportsManyanimalsengageinp
SportsManyanimalsengageinp
SportsManyanimalsengageinp
SportsManyanimalsengageinp
随机试题
【B1】[br]【B10】A、littleB、manyC、muchCFromthenon,hegavethedogasmuchasi
FormanyyearsafterheformedhisTheoryofRelativity,AlbertEinsteinvis
茶马古道(theAncientTeaHomeRoad)是中国西南地区一条重要的商贸通道,兴起于唐宋时期。兴盛于明清时期。它源起于云南茶叶主产区普
Everybodywantstogetwealthy.Intoday’s【B1】______world,makingmoneyor
[originaltext]M:Canyoucometomyofficeat9tomorrowmorning?W:I’mafraid
角蛋白抗体(AKA)和下面哪种疾病最为相关:A.干燥综合征 B.系统性硬化症
下列各项,不属经前期综合征范畴的病证是A.经行乳胀 B.经行泄泻 C.经行水
某教师针对下列习题的教学片段。 习题:如图所示,匀强磁场的磁感应强度B(T)
某机场1996~2000年的主营业务收入分别为300、600、900、1200和
某运输企业贷款1000万元购买设备,年利率8%,五年末一次还本付息,终值系数为1
最新回复
(
0
)