| 11. | A wave of excitation spreads out from the sinoatrial node through the atria along specialized conduction channels.
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| 12. | Pacemaker potentials are fired by sinoatrial node ( SAN ), but also by the other foci.
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| 13. | Acetylcholine hyperpolarizes the sinoatrial node, which is overcome by MRA and thus increases the heart rate.
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| 14. | From head to tail, these are the atrium, the sinoatrial node and the coronary sinus.
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| 15. | Pacemaker cells develop in the primitive atrium and the sinus venosus to form the sinoatrial node and the atrioventricular node respectively.
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| 16. | This condition, called tachycardia-bradycardia syndrome, is usually caused by sinoatrial node dysfunction or block or atrioventricular block.
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| 17. | The heart has a sort of central controller called the sinoatrial node, which serves as pacemaker for the whole system.
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| 18. | The normal rhythmical heart beat, called sinus rhythm, is established by the sinoatrial node, the heart's pacemaker.
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| 19. | The sinoatrial node is found in the upper part of the right atrium near to the junction with the superior vena cava.
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| 20. | The electrical signal generated by the sinoatrial node travels through the right atrium in a radial way that is not completely understood.
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