Structures of the Conducting System of the Heart | Western Sydney University - Edubirdie

University:
Western Sydney University
Course:
MEDI 2003 | Clinical Sciences 2
Academic year:

2024
Views:

155

Pages:

2
Author:

Mariam A. A.

Structures of the conducting system of the heart ● ● Heart is under involuntary control Needs a nerve supply to contract → conducting system Nodes ● Accumulation of nerve cells that are going to fire off a signal to initiative contractions of the heart SA node ● Pacemaker of the heart, starts the contraction process, starts firing up the signals (ACTION POTENTIALS), cascade of nerve signals to start contractions of the heart ● Near the entrance of the coronary sinus in the atrium ● Some nerve signals stop in the atrium or move into the AV ● Between the coronary sinus and atrial wall ● Sets the pace of the nerve fibres to set the pace for contractions AV node ● Nerve signals then go to the AV node ● In the wall between the atrium and ventricle (still in the R atrium) ● Nerves will go into the interventricular wall through the Purkinje fibres ● Signal spreads along the branches of the Purkinje fibres to the cells in the ventricles which will contact ● Allows the ventricles to have the power to contract and pump the blood out of the heart to their target organs Pathophysiology ● Cannot coordinate contractions with the heart ● Needs pacemakers, defibrillators to take on the role of the conducting system Workshop notes: ● Arrhythmia of the atria - rhythm of filling and moving the blood to the ventricles is not a regular rhythm - misfiring (too fast or too slow) ● ‘Itis’ means inflammation of

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