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心脏101:国家地理

Heart 101 | National Geographic

The heart pumps blood throughout the body.
心脏将血液泵送到全身
Carrying oxygen and nutrients to every cell.
为每个细胞输送氧气和养分
It’s this circulation of blood that is vital
正是这种血液循环
to sustaining life.
对维持生命非常重要
The heart is an organ made up of several tough layers of muscle.
心脏是由几层坚硬的肌肉构成的器官
The pericardium is the thin layer that covers the exterior
心包是包裹在心脏外部的薄层
while the endocardium lines the inside walls.
而心内膜附着在心脏内壁
The heart is divided into four chambers.
心脏又分为四个腔室
Two upper and two lower.
两个在上 两个在下
The upper chambers known as the atrium receive blood coming into the heart.
称为心房的上腔室接收流入心脏的血液
The lower chambers are the ventricles that pump blood out.
而称为心室的下腔室负责泵出血液
Between each chamber are valves that open and close
在每个腔室之间都有能开闭的瓣膜
and help keep the blood moving.
它们能够维持血液循环
They are the tricuspid, mitral,
它们分别是三尖瓣 二尖瓣
pulmonary, and aortic valves.
肺动脉瓣和主动脉瓣
A pumping cycle starts when oxygen-depleted blood
当流遍全身的缺氧血液回到心脏时
returns to the heart after circulating throughout the body.
又开始新一轮的血液循环
The blood enters through the right atrium
血液从右心房流出
before flowing to the right ventricle.
再流入右心室
It’s then pumped to the lungs via the pulmonary arteries.
然后通过肺动脉将其泵入肺部
There blood is rejuvenated by air that’s breathed in.
在那里 吸入的空气可以将血液“复活”
The oxygen-rich blood returns to the heart through the left atrium
富氧血液通过左心房回到心脏
where it goes to the left ventricle.
再进入左心室
Then by way of the aorta artery the fresh blood is pumped throughout the body
新鲜血液又通过主动脉泵送到全身
before the process repeats itself.
整个过程会不断地重复进行
That process happens with every heartbeat.
血液循环发生在每一次心跳中
And it’s relentless.
而且永不停息
The heart beats 100,000 times a day.
心脏每天跳动10万次
40 million times a year
一年大约4000万次
and up to three billion times over an average lifespan.
在人的一生中平均可高达30亿次
But there are conditions that can disrupt a heartbeat and that normality.
但有些情况会扰乱心跳和其规律性
They can range from myocardial infarction or heart attack
这些情况可能是心肌梗塞
to heart disease and hypertension.
也有可能是心脏病和高血压发作
In contrast, exercise and emotional excitement
相比之下 运动和情绪激动
can also have an impact on a person’s heartbeat.
也会对人们的心跳产生影响
The various blood vessels that comprise the circulatory system
由静脉 动脉和毛细血管组成的循环系统
are a network of veins, arteries, and capillaries
是遍布全身的网络
that span over 60,000 miles throughout the body.
全网长度可跨人体6万多英里
And the heart is the pump at the center of it.
而心脏正是血液循环的中心枢纽

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视频概述

心脏作为血液循环的中心枢纽,有着举足轻重的作用。本期国家地理主要介绍了心脏的结构和作用……

听录译者

收集自网络

翻译译者

Judhen

审核员

审核员XY

视频来源

https://www.youtube.com/watch?v=GMBSU-2GK3E

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