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Sinoatrial node
The sinoatrial node (often abbreviated SA node; also commonly called the sinus node and less commonly the sinuatrial node) is the pacemaker of the heart and is responsible for the initiation of the heartbeat. It spontaneously generates an electrical impulse, which after conducting throughout the heart, causes the heart to contract. Although the electrical impulses are generated spontaneously, the rate of the impulses (and therefore the heart rate) is set by the nerves innervating the sinoatrial node. The sinoatrial node is located in the right atrium (upper chamber) of the heart.
==Discovery==
It was first discovered by a young medical student, Martin Flack, in the heart of a mole, whilst his mentor, Sir Arthur Keith, was on a bicycle ride with his wife. They made the discovery in a makeshift laboratory set up in a picturesque farmhouse in Kent, England, called Mann's Place. Their discovery was published in 1907.
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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