His heart has divided into four Chambers and its valves are beginning to form.

他的心脏已经分成了四个腔室，瓣膜也开始形成了。

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Normally the sinoatrial node generates regular electrical pulses that spread across the Chambers of the heart, causing the cells to contract in synchrony.

正常情况下，窦房结产生规律的电脉冲，传入各心房，再带动细胞同步收缩。

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A human heart, by contrast, has four chambers. Two of these pump blood to the lungs, where it picks up oxygen, then the other two pump this oxygenated blood throughout the body.

相比之下，人的心脏只有四个心室，其中的两个心室收缩将血液压进动脉输送到肺部，在那里吸收氧气，放出二氧化碳，而另两个心室则将完成气体交换后的血液输送到到全身。

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The upper chambers of the heart quiver or beat too fast or too slow.

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This is a potentially deadly condition in which the individual chambers of a heart beat out of phase with each other.

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"His pulmonary artery is in the wrong position so it doesn't go through his two heart chambers, it's in the middle, " said Mr Barham.

BBC: Quinton Barham has cardiac arrest in football game