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प्रश्न
Why do we call our heart myogenic?
थोडक्यात उत्तर
उत्तर
- 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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संबंधित प्रश्न
Describe the mechanism by which the human heart beat is initiated and controlled.
Cardiac activity could be moderated by the autonomous neural system. Tick the correct answer:
Parasympathetic neural signals can ______.
A special neural centre that regulates cardiac function through ANS is located in ______.
