It can improve heart action.

游泳能增进心脏活动。

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The blood flow may be increased by more rapid and vigorous heart action.

心脏活动加快和增强可使血流增加。

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Swimming improves heart action, aids blood circulation, and helps develop firm muscles.

游泳改善你的心脏起搏，增加血液的循环能力，并且有助于肌肉成型。

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The American Heart Association tells how to take that action.

VOA: special.2009.08.11

Now, in the heart action potential is moving from one heart muscle cell to another over the surface of the heart.

心脏中的动作电位,沿相邻心肌细胞在心脏表面传递

耶鲁公开课 - 生物医学工程探索课程节选

When we measure EKG's, what we're measuring is the activity of all these cells within our heart performing action potentials.

当我们做心电图的时候,我们所测量的是心脏内能发出,动作电位的细胞的活动状态

耶鲁公开课 - 生物医学工程探索课程节选

Dr. HERMIETTA EDENBURG (Physician, Doctors Without Borders Hospital, Dubea, Democratic Republic of Congo): The history is that there is diarrhea for a couple of days, so what happens is, in that she is severely dehydrated, and she came in in a really bad state with hardly no pulse or heart action anymore, because of the dehydration.

NPR: Congo Violence Creates Medical Crisis

The flags are already out across the United Kingdom and CNN will be at the heart of action as the country gears up for a long weekend of revelry from June 2-5.

CNN: What's on during Diamond Jubilee weekend

In the region itself there was little heart for military action before, and even less now.

ECONOMIST: Iraq