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| Pacemaker cells ： ウィキペディア英語版 |
Cardiac pacemaker
The contraction of heart (cardiac) muscle in all animals is initiated by electrical impulses known as action potentials. The rate at which these impulses fire control the rate of cardiac contraction or the heart rate. The cells that create these rhythmical impulses are called pacemaker cells, and they directly control the heart rate.
In humans, and occasionally in animals, a mechanical device called an artificial pacemaker (or simply "pacemaker") may be used after damage to the body's intrinsic conduction system to produce these impulses synthetically.
==Control==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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