Calcium is essential for healthy heart muscles and regulation of the heartbeat.

钙对心脏肌肉的健康至关重要，它调节心跳着的频率。

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G protein-coupled receptors play a critical role in heart disease, blood pressure regulation, inflammation and psychological disorders.

蛋白偶联受体在心脏病、血压调节、炎症和心理疾病中扮演关键角色。

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Magnesium is necessary for muscle contraction, heart rate regulation, and muscle growth. Strenuous exercise can rapidly deplete the body's stores of magnesium; supplements are often helpful.

镁是肌肉收缩、生长和心跳速度正常的必要物质。高强度的运动会快速消耗身体中的镁。镁补充剂因此很有益。

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The scientists found that people with this defect would suffer a chronic malfunction of calcium regulation in their heart muscle.

BBC: Gene link to inherited heart disease

Financial regulation is at the heart of that argument.

BBC: JPMorgan losses a headache for Romney?

Gore at heart is a believer in command and control regulation while Bush has a healthy skepticism about how much the government can guide us.

FORBES: Election Stranger Than Fiction