Lab10 Electrocardiogram 2010

Lab10 Electrocardiogram 2010 - Electrocardiogram...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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 ...
View Full Document

Ask a homework question - tutors are online