control of cardiac cycle
Post on 15-Jun-2015
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Control of the Cardiac Cycle
L/O To be able to identify key features of an ECGTo know the roles of the sinoatrial node, the atrioventricular node and the Purkyne tissue
13 April 2023
Myogenic Heart
• http://www.youtube.com/watch?v=MojGH5PXSTU
Synchronised pumping
Defibrillation
TV Lies
TV Lies
Control of the Cardiac Cycle
• Sinoatrial node (SAN) aka pacemaker – top of right atrium
• Atrioventricular node (AVN) – top of the inter-ventricular septum
• Purkyne Tissue – runs down the inter-ventricular septum
SAN, AVN and Purkyne Tissue
SAN, AVN and Purkyne Tissue
Electrocardiograms
Electrocardiograms
P = atrial excitation
QRS = excitation of ventricles
T = diastole
Heart Attacks
• Heart muscle respires fatty acids• Respiration of fat can only happen aerobically,
so the heart needs oxygen• A blood clot in the coronary artery starves
part of the heart muscle of oxygen and those cells die
Heart murmurs
• http://www.youtube.com/watch?v=XvtBpnV_lOE
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