2021年医学考博英语听力复习资料:病毒

考博英语 责任编辑:胡陆 2020-10-30

摘要:听力理解是考博英语的必考题型之一,也最为考研学生的英语水平。希赛网考博英语频道为大家分享医学考博英语统考听力素材,希望能给各位考生带来帮助。

根据全国医学博士外语统一考试大纲可知,全国医学博士外语统一考试听力部分占试卷总分值的30%,包括SectionA和SectionB部分,通常以细节题、推断题、固定词组等考查为主。下面小编为大家介绍分享医学考博英语听力对话备考资料,跟小编一起来学习下吧。

新冠病毒进入人体会发生什么?

Projecting  from the envelope are spikes of protein molecules. Both a typical influenza virus and the new coronavirus use their spikes like a key to get inside a cell in your body, where it takes over its internal machinery, repurposing it to build the components of new viruses.

When an infected person talks, coughs or sneezes, droplets carrying the virus may land in your mouth or nose and then move into your lungs. Once inside your body, the virus comes into contact with cells in your throat, nose or lungs. One spike on the virus inserts into a receptor molecule on your healthy cell membrane  like a key in a lock. This action allows the virus to get inside your cell.

A typical flu virus would travel inside a sack made from your cell membrane to your cell’s nucleus that where your cell houses all its genetic material . The coronavirus, on the other hand, doesn’t need to enter the host cell  nucleus. It can directly access parts of the host cell, called Ribosomes  Ribosomes use genetic information from the virus to make viral proteins, such as the spikes on the virus’ surface.

A packaging structure in your cell then carries the spikes in vesicles, whichmerge with your cell's outer layer, the cell membrane. All the parts needed to create a new virus gather just beneath your cell's membrane. Then a new virus begins tobutt off  from the cell's membrane.

For this, we’ll have to look into your lungs. Each lung has separate sections, calledlobes . Normally, as you breathe, air moves freely through your trachea, or windpipe, then through large tubes, called bronchi , through smaller tubes, called bronchioles  and finally into tiny sacs, called alveoli . Your airways and alveoli are flexible and springy .

When you breathe in, each air sac inflates like a small balloon. And when you exhale, the sacs deflate. Small blood vessels, called capillaries , surround your alveoli. Oxygen from the air you breathe passes into your capillaries, then carbon dioxide  from your body passes out of your capillaries into your alveoli so that your lungs can get rid of  it when you exhale. Your airways catch most germs in the mucusthat lines your trachea, bronchi, and bronchioles. In a healthy body, hair-like cilia lining  the tubes constantly push the mucus and germs out of your airways, where you may expel  them by coughing.

Normally, cells of your immune system attack viruses and germs that make it past your mucus and cilia and enter your alveoli. However, if your immune system is weakened like in the case of a coronavirus infection, the virus can overwhelm  your immune cells and your bronchioles and alveoli become inflamed (发炎), your immune system attacks the multiplying viruses . The inflammation can cause your alveoli to fill with fluid, making it difficult for your body to get the oxygen it needs. You could develop lobar pneumonia , where one lobe of your lungs is affected, or you could have bronchopneumonia  that affects many areas of both lungs.

Pneumonia may cause difficulty breathing, chest pain, coughing, fever, and chills , confusion , headache, muscle pain, and fatigue. It can also lead to moreserious complications : respiratory failure occurs when your breathing becomes so difficult that you need a machine called a ventilator to help you breathe. These are the machines that save lives and medical device companies currently ramp upproduction for. Whether you would develop these symptoms depends on a lot of factors, such as your age and whether you already have an existing condition .

While all this all sounds scary, the push to develop a coronavirus vaccine is moving at high speed. Studies of other coronaviruses lead most researchers to assume that people who have recovered from a SARS-CoV-2 infection could be protected from reinfection for a period of time. But that assumption needs to be backed by empirical evidence  and some studies suggest otherwise.

There are several different approaches for a potential vaccine against the coronavirus. The basic idea is that you would get a shot that contains faint versions of the virus. The vaccine would expose your body to the virus that is too weak to cause infection but just strong enough to stimulate an immune response. Within a few weeks, cells in your immune system would make markers called antibodies , which would be specific for only the coronavirus or specifically its spike protein .

Antibodies then attach to the virus and prevent it from attaching to your cells. Your immune system then responds to signals from the antibodies by consuming and destroying the clumps of viruses. If you then catch the real virus at a later stage, your body would recognize and destroy it. In other words, your immune system is now primed .

Collecting evidence on whether this will be possible, safe and effective is part of what’s taking researchers so long to develop a vaccine. It is a race against time to develop a vaccine amid a pandemic. Each step in vaccine development usually takes months if not years. An Ebola vaccine broke records by being ready in five years. The hope here is to develop one for the new coronavirus in a record-breaking 12 to 18 months. While all this will take time, stay home if you can to protect the most vulnerable and don’t forget to wash your hands for at least 20 seconds and as often as possible.

注:以上内容来源于网络,如有侵权,可联系客服删除。

更多资料
更多课程
更多真题
温馨提示:因考试政策、内容不断变化与调整,本网站提供的以上信息仅供参考,如有异议,请考生以权威部门公布的内容为准!

考博英语备考资料免费领取

去领取

2024年考博英语考试

具体时间待通知

专注在线职业教育23年

项目管理

信息系统项目管理师

厂商认证

信息系统项目管理师

信息系统项目管理师