Physiology lecture 6 0.0 / 5 ? BiologyCVS 2UniversityNone Created by: willmiddlehamCreated on: 03-04-15 13:55 What are the two groups of myocytes? 1) Work cells 2) Conduction cells/system 1 of 11 What do work cells do? Generate force 2 of 11 What do conduction cells do? The fast spread of electrical events throughout heart 3 of 11 Where does the initiation of the heart beat begin? Sino atrial node (right atrium) 4 of 11 What are the two ways of the spread of excitation? 1) Cell --> cell via gap junctions 2) Via the specialised conducting fibres 5 of 11 Name 4 electrical conducting tissues 1) Sino-atrial node 2) Atrio ventricular node 3) Bundle of His 4) Purkinje fibres 6 of 11 Draw an electrocardiogram and label Q, R and S (Draw electrocardiogram) 7 of 11 Draw the action potential in heart muscle and what is it called? Trigger calcium, (Draw AP) 8 of 11 Name the two kinds of arrhythmias 1) Impulse propagation (conduction) 2) Impulse initiation 9 of 11 Describe what atrial fibrillation is Due to damaged cells producing an abnormal firing of APs 10 of 11 Describe what ventricular fibrillation is Ineffective contractions so blood flow stops (mot dangerous) 11 of 11
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