Why Do We Call Our Heart Myogenic?

Contractions in the human heart (situated in the inside of the thoracic cavity) are triggered by a specialized altered muscle of the heart referred to as the sinoatrial node which is positioned in the right atrium. The SA node has the inherent capability to generate a wave of contraction and also controls the heartbeat which is why it is termed as the pacemaker. As the heartbeat is triggered by the sinoatrial node, and impulse of contraction originates in the heart, the human heart is known as myogenic. Molluscs and some other vertebrates also have myogenic hearts. 

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