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Question
Why do we call our heart myogenic?
Answer in Brief
Solution
- In the human heart, contraction is initiated by a special modified heart muscle known as sinoatrial node. It is located in the right atrium. The SA node has the inherent power of generating a wave of contraction and controlling the heart beat. Hence, it is known as the pacemaker.
- Since the heart beat is initiated by the SA node and the impulse of contraction originates in the heart itself, the human heart is termed myogenic. The hearts of vertebrates and molluscs are also myogenic.
- All animals, including humans, have myogenic hearts. It indicates that the sinoatrial node, also known as a pacemaker, is a patch of modified heart muscle located in the right atrium wall, close to the superior vena cava entrance, and it is responsible for starting the heartbeat.
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Regulation of Cardiac Activity
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