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Lab10 Electrocardiogram 2010

Lab10 Electrocardiogram 2010 - Electrocardiogram...

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Unformatted text preview: Electrocardiogram Electrocardiogram Heart ­ Myocardium Heart ­ Myocardium Function(s): Regulating blood supply Generate blood pressure Routing blood Ensuring one way blood flow 4 Chambered Heart right/left atria Receive blood right/left ventricles Pump blood out of heart Myogenicity – beats on its own Anatomy Anatomy Rhythmicity ­ Systolic/Diastolic cycles S Systolic Phase (Contractive Phase) Ventricle pressure raises Ventricles Contract and expel blood Cardiac Cycle Cardiac Cycle D Diastolic Phase (Relaxation Phase) Ventricles begin to relax Semilunar valves close Atria contract filling the ventricles w/ blood Contraction/Relaxation Cycles Contraction/Relaxation Cycles S Sinoatrial Node “SA node” (Pacemaker) Regulates the cycle of the entire myocardium Depolarization spreads across R & L atria Atria contract pushing blood into Ventricles A Atrioventricular node (AV node) Bundle of His = R & L branches, carry depolarization to the Apex Purkinje Fibers, innermost cells of the ventricles = network of branching Ventricles contract pumping blood out the heart SA node initiates another cycle Electrical Control Electrical Control Sinoatrial node (SA Node) “pacemaker” Atrioventricular node ( (AV Node) Septum Bundle of His Purkinje Fibers Endocrine & Neurotransmitter Control Endocrine & Neurotransmitter Control Acetylcholine Decreases the Heart Rate Norepinephrine “Fight or Flight” response Increases the Heart Rate & causes release of glucose for energy E Epinephrine (Adrenaline) Adrenal Medulla → Blood “Fight or Flight” response Constricts blood vessels & Increases the Heart Rate Electrocardiograph Electrocardiograph Electrocardiogram ­ graphic representation of myocardial electrical activities Positive Lead Negative Lead Ground Lead Conductive Electrocardiograph Electrocardiograph P wave QRS complex Depolarization of the Atria Atria contract Depolarization of the Ventricles Ventricles contract Repolarization of the Ventricles Ventricles relax T wave ECG Helps to Diagnose: ECG Helps to Diagnose: Heart Attacks Irregular Heart Beat Blockages Premature ventricular contractions Student Trials in manual (page 61) 2 2 Students, same sex (1 trained and 1 untrained) Experiment Addition Experiment Addition Trained (athletic) vs Untrained (non­athletic) Student Trials Calculate Heart Rate Take pulse reading for 30 seconds count number of pulses and multiply by 2 write data on board Prelab questions on pages 60­61 in lab notebook ECG and Heart Sounds Skip Experiment 3. Only do 1, 2, and 4. Experiment 1: ECG at Rest 1 Person Experiment 2: ECG with Variation 3 People Experiment 4: Cardio Microphone 1 Person Keywords: Myogenicity, myocardial ischemia, HDL cholesterol ...
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