我们的心脏是位于胸腔中央的单个器官
Our heart is a single organ located centrally in the thoracic cavity
它由两个心腔组成
It is composed of both two heart chambers
进一步细分成两个心房和两个心室
further divided into two atria and two ventricles
以及一个由动脉、毛细血管和静脉组成的血管网络
and a network of arteries capillaries and veins
将血液从心脏输出再输送回心脏
that carries blood away from the heart and back to the heart
动画显示了两个心室
The animation shows here the two ventricles
这是心房
Here the atrium
两条静脉，上腔静脉和下腔静脉，会将血液输送到心脏
Two veins, the superior vena cava and the inferior vena cava, carry blood to the heart
我们从下腔静脉开始探索
Our exploration starts from the inferior vena cava
沿着静脉，我们到了右心房
Through this vein, we reach the right atrium
这里是上腔静脉的流出道和传导组织
The animation shows the outflow tract of the superior vena cava and the conducting tissues
将由窦房结产生的电脉冲
Then transmit the electrical impulses generated by the sinus node
传输到房室结
towards the atrioventricular node
然后将其传导到心室
which then conducts the impulse to the ventricles
通过由三张小叶组成的三尖瓣
Through the tricuspid valve which is made up of three leaflets
我们进入了右心室，右心室内表面粗糙
We enter the right ventricle that represents a rough internal surface
有许多乳头肌
with many papillary muscles
然后，我们通过肺动脉瓣进入肺动脉
Then, we enter the pulmonary artery through the pulmonary valve
可以看到肺动脉干分叉
where we find the bifurcation of the pulmonary trunk
和动脉导管的流出道
and the outflow tract of the ductus arteriosus
血液从肺动脉流出，流向肺部，在那里再被氧化。
From the pulmonary artery, the blood flows to the lungs where it is re-oxygenated
然后肺静脉将血液输送到左心房
Afterwards the pulmonary veins carry the blood to the left atrium.
这是右肺静脉的流出道
Here is the outflow tract of the right pulmonary veins
二尖瓣由两个小叶组成
The mitral valve which is made up of two leaflets
调节左心房和左心室之间的血流
regulates blood flow between the left atrium and the left ventricle
然后通过由三个小叶组成的主动脉瓣
Then through the aortic valve which is made up of three leaflets
我们进入升主动脉，上主动脉干的起源
We enter the ascending aorta, the origin of supra-aorta trunks
总动脉干
The common artery trunk
左颈总动脉
the left common carotid artery
左锁骨下动脉
the left subclavian artery
最后，主动脉将血液输送到全身
In the end, the aorta carries the blood throughout the body