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- Cardiac_pacemaker abstract "The contraction of heart (cardiac) muscle in all animals with hearts is initiated by electrical impulses. The rate at which these impulses fire controls the heart rate. The cells that create these rhythmical impulses are called pacemaker cells, and they directly control the heart rate.In humans, and occasionally in other animals, a mechanical device called an artificial pacemaker (or simply "pacemaker") may be used after damage to the body's intrinsic conduction system to produce these impulses synthetically.The pacemaker is located in the wall of the right atrium.1% of the Cardiomyocytes in the myocardium possess the ability to generate electrical impulses (or action potentials). A specialized portion of the heart, called the sinoatrial node, is responsible for atrial propagation of this potential.The sinoatrial node (SA node) is a group of cells positioned on the wall of the right atrium, near the entrance of the superior vena cava. These cells are modified cardiomyocyte. They possess rudimentary contractile filaments, but contract relatively weakly.Cells in the SA node spontaneously depolarize, resulting in contraction, approximately 100 times per minute. This native rate is constantly modified by the activity of sympathetic and parasympathetic nerve fibers, so that the average resting cardiac rate in adult humans is about 70 beats per minute. Because the sinoatrial node is responsible for the rest of the heart's electrical activity, it is sometimes called the primary pacemaker.".
- Cardiac_pacemaker thumbnail ConductionsystemoftheheartwithouttheHeart-en.svg?width=300.
- Cardiac_pacemaker wikiPageID "233429".
- Cardiac_pacemaker wikiPageRevisionID "594519306".
- Cardiac_pacemaker hasPhotoCollection Cardiac_pacemaker.
- Cardiac_pacemaker subject Category:Cardiac_anatomy.
- Cardiac_pacemaker subject Category:Cardiac_electrophysiology.
- Cardiac_pacemaker subject Category:Medical_devices.
- Cardiac_pacemaker comment "The contraction of heart (cardiac) muscle in all animals with hearts is initiated by electrical impulses. The rate at which these impulses fire controls the heart rate.".
- Cardiac_pacemaker label "Cardiac pacemaker".
- Cardiac_pacemaker sameAs m.01hy5_.
- Cardiac_pacemaker sameAs Q3635544.
- Cardiac_pacemaker sameAs Q3635544.
- Cardiac_pacemaker wasDerivedFrom Cardiac_pacemaker?oldid=594519306.
- Cardiac_pacemaker depiction ConductionsystemoftheheartwithouttheHeart-en.svg.
- Cardiac_pacemaker isPrimaryTopicOf Cardiac_pacemaker.
