sinoatrial node वाक्य
उदाहरण वाक्य
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- The right coronary artery also supplies blood to the atrioventricular node ( in about 90 % of people ) and the sinoatrial node ( in about 60 % of people ).
- Encouraged by their initial success and inspired by Tawara's discovery of the atrioventricular node, Keith and Flack extended their studies and eventually discovered the sinoatrial node in 1907.
- The normal resting heart rate is called the sinus rhythm, created and sustained by the sinoatrial node, a group of pacemaking cells found in the wall of the right atrium.
- :It's modulated by the autonomic nervous system, however the pacemaker cells of the sinoatrial node do not require any input from the CNS to induce the heart beat.
- This may cause a single premature beat now and then, or, if the ectopic focus fires more often than the sinoatrial node, it can produce a sustained abnormal rhythm.
- The sinoatrial node shows a small concentration of purkinje fibers, however, continuing through the conducting pathway of the heart the bundle of his shows the highest amount of these purkinje fibers.
- Tawara's discovery of the atrioventricular node prompted Arthur Keith and Martin Flack to look for similar structures in the heart, leading to their discovery of the sinoatrial node several months later.
- In junctional rhythm, however, the sinoatrial node does not control the heart's rhythm-this can happen in the case of a block in conduction somewhere along the pathway described above.
- Excitation-contraction coupling in cardiac muscle cells occurs when an action potential is initiated by pacemaker cells in the Sinoatrial node or Atrioventricular node and conducted to all cells in the heart via gap junctions.
- It was used by Arthur Keith and Martin Flack as a detailed guide in their attempts to verify the existence of the Bundle of His, which subsequently led to their discovery of the sinoatrial node.
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