心脏英语

Your heart is a pump. It's a muscular organ about the size of your fist and is located slightly left of the center in your chest. Your heart is divided into the right and left side. The division protectsoxygen-rich (富氧的) blood from mixing withoxygen-poor (缺氧的) blood. Together, your heart and blood vessels comprise your cardiovascular system (心血管系统), which circulates blood and oxygen around your body. In fact, your heart pumps about five quarts (夸脱) of blood every minute and it beats about 100000 times in one day. That's about 35 million times in a year. 你的心脏是一个泵。它是一个与你拳头一样大小的肌肉器官，位于胸部中心的左半部分。你的心脏分为左右两侧。师protectsoxygen丰富（富氧的）混合与较差的血液（血缺氧的）。在一起，你的心脏和血管，包括心血管系统（心血管系统），循环血液和氧气到你的全身。事实上，你的心泵约五夸脱（夸脱）血液每分钟跳动约100000次，这一天。一年大约3500万次。

你的心脏是一个泵。 这是一个关于你的拳头大小的肌肉发达的器官，位于你胸前的中央左侧。 你的心分为左右两边。 该分裂保护富氧的血液免于与缺氧的血液混合。 在一起，你的心脏和血管构成你的心血管系统，心血管系统在身体周围循环血液和氧气。 事实上，你的心脏每分钟会抽出五夸脱（夸脱）的血液，并在一天内跳过10万次。 这大概是一年3500万次

Oxygen-poor blood (blue blood) returns to the heart after circulating through your body. The right side of the heart, composed of the right atrium and ventricle (右心房和右心室), collects and pumps the blood to the lungs through thepulmonary arteries (肺动脉). The lungs refresh the blood with a new supply of oxygen, making it turn red. Oxygen-rich blood (red blood) then enters the left side of the heart, composed of theleft atrium and ventricle (左心房和左心室), and is pumped through the aorta (主动脉) to the body to supply tissues with oxygen.

缺氧的血液（蓝色血液）通过身体循环后返回心脏。 由右心房和右心室组成的心脏右侧通过肺动脉（肺动脉）收集并泵送血液到肺部。 肺部用新的氧气供应刷新血液，使其变红。 富氧血液（红血）进入心脏的左侧，由左心房和左心室（左心房和左心室）组成，通过主动脉泵入身体，为组织提供氧气。

贫氧血液（蓝血）在体内循环后回到心脏。心脏的右侧，由右心房和右心室（右心房和右心室），收集并将血液泵到肺通过肺动脉（肺动脉）。肺用新的氧气补充血液，使其变红。富氧血（红）然后进入心脏左侧，由左心房和心室（左心房和左心室），并被泵入主动脉（主动脉）对机体组织供血。

Four valves (瓣膜) within your heart keep your blood moving the right way. The tricuspid, mitral, pulmonary and aortic valves (三尖瓣、二尖瓣、肺动脉瓣和主动脉瓣) work like gates on a fence. They open only one way and only when pushed on. Each valve opens and closes once per heartbeat. (Or about once every second.)

心脏四瓣（瓣膜）保持血液正常移动。 三尖瓣，二尖瓣，肺动脉瓣和主动脉瓣的工作方式类似栅栏上的闸门。 他们只有一种方式，只有当推动。 每个阀门每次心跳打开和关闭一次。 （或者每秒大概一次）

四阀门（瓣膜）在你的心中，让你的血液流动的正确方法。三尖瓣、二尖瓣、肺动脉和主动脉瓣（三尖瓣、二尖瓣、肺动脉瓣和主动脉瓣）像盖茨在篱笆。他们只开一条路，只有在打开的时候才打开。每个阀门每心跳一次打开和关闭。（大约每秒钟一次）。

A beating heart contracts and relaxes. Contraction is called systole (心缩期) and relaxing is called diastole (心舒期). During systole yourventricles (心室) contract, forcing blood into the vessels going to your lungs and body, much like ketchup being forced out of a squeeze-bottle (挤压瓶). The right ventricle contracts a little bit before the left ventricle does. Your ventricles then relax during diastole and are filled with blood coming from the upper chambers, the left and right atria (心房). Then the cycle starts over again.

一颗跳动的心脏收缩和放松。 收缩称为心缩期（systole），舒张称为舒张（心舒期）。 在心室收缩的过程中，迫使血液进入到你的肺部和身体的血管中，就像番茄酱被挤出挤压瓶（挤压瓶）一样。 在左心室之前右心室收缩一点点。 心室在心脏舒张期间放松，充满了来自上心房，左心房和右心房的血液。 然后循环再次开始

跳动的心收缩和放松。收缩是收缩和放松（心缩期）称为舒张（心舒期）。你的心室收缩时（心室）合同，迫使血液进入血管，将你的肺部和身体，就像番茄酱被迫离开挤压瓶（挤压瓶）。右心室在左心室收缩前收缩一点。心室舒张期然后放松和充满血液来自上腔，心房左、右（心房）。然后循环重新开始。

Your heart is nourished by blood too. Blood vessels called coronary arteries (冠状动脉) extend over the surface of your heart and branch into smaller capillaries (毛细血管). Here you can see just the network of blood vessels that feed your heart with oxygen-rich blood.

Your heart also has electrical wiring which keeps it beating. Electrical impulses (电脉冲) begin high in the right atrium and travels through specialized pathways to the ventricles, delivering the signal to pump. The conduction system (传导系统) keeps your heart beating in a coordinated and normalrhythm (节奏), which in turn keeps blood circulating.

The continuous exchange of oxygen-rich blood with oxygen-poor blood is what keeps you alive.

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