This involves stimulating both the left and right sides of the heart, in order to synchronise their contraction. That, in turn, improves the pumping action.

此类治疗通过对心脏左右两部分的刺激来实现二者的同步收缩，进而改善心跳。

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An electrical wave traverses the heart each time it beats, co-ordinating the contraction and relaxation of the chambers that pump blood around the body.

随着心室的收缩和舒张将血汞到了全身，心脏跳动一次，电波横穿心脏一次。

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The second figure represents the pressure of the heart as it expands and fills with blood, while waiting for the next contraction.

第二个数字代表了心脏的压力，因为它的扩展和血液填充，而等待下一次收缩。

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We're going to come back and talk about the action potential a little bit more when we talk about how the heart works, because the heart when its contracting, the muscle cells also use action potentials to initiate contraction.

我们讲心脏工作原理时,会回头再多讨论一点动作电位,因为心脏收缩时,肌肉细胞也利用动作电位来启动收缩

耶鲁公开课 - 生物医学工程探索课程节选