Study_Guide_for_Lectures_1_to_4_2013.doc

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Department
Biological Sciences
Course
BIOC34H3
Professor
Stephen Reid
Semester
Winter

Description
1 BIOC33/CC4 Cardiovascular System (Lectures 1-4) Study Guide (2013) Lecture 1: Electrical Conduction within the Heart Topics The Conduction System of the Heart Pacemaker Potential Sample Questions 1. What is the pathway of electrical conduction in the heart? SA node  Bundle of His  AV node  Purjinke fibers 2. Which changes in ionic conductance (permeability) accompany the various phases of the pacemaker potential? 3. 4. 1. 2. a) In zone 1, a decrease in K and an increase in PNa In zone 2, an increase in PCa b) In zone 1, a decrease in PKand an increase in PCa In zone 2, an increase in PNa c) In zone 3, a large increase in Na: In zone 4, an increase inKP and a decrease in Ca d) In zone 3, a large increase in Ca: In zone 4, an increase inKP and a decrease in Na e) A and D 3. The action potential that travels along the conduction pathway of the heart moves upward into the ventricles (from the apex of the heart) via the ? a) AV node b) SA node c) Purkinje Fibres d) Atrioventricular valves e) Bundle of His 2 Lecture 2: Cardiac Action Potential and the Electrocardiogram Topics The Cardiac Action Potential Standard Bipolar Limb Leads and Einthoven’s Law Components of the ECG Wave Correlation of the ECT Components with the Electrical Conduction Through the Heart Interpreting ECGs Rate Rhythm Segments of the ECG Trace Arrhythmia Sample Questions 1. Which changes in ionic conductance (permeability) accompany the various phases of the cardiac action potential? 2. What do the different components of the ECG represent (i.e., T wave)? 3. Which changes in ionic conductance (permeability) DO NOT accompany the various phases of the cardiac action potential? a) In zone 0, an increase in P Na b) In zone 1, a decrease in PNa a decrease in PKand an increase in P Ca c) In zone 2, a decrease in Naand an increase in P Ca d) In zone 3, an increase in K and a decrease in PCa e) C and D 4. The P and T waves of the ECG represent and , respectively. a) Ventricular repolarisation and atrial depolarisation. b) Atrial depolarisation and atrial repolarisation. c) Ventricular depolarisation and atrial repolarisation. d) Atrial depolarisation and ventricular repolarisation. e) Atrial depolarisation and ventricular depolarisation. 3 5. The following ECG trace is representative of what cardiac disorder? a) Atrial flutter. b) Atrial fibrillation. c) Ventricular fibrillation. d) Wandering atrial pacemaker. e) Second degree heart block. 4 Lecture 3: ECGs, Electrical Axis of the Heart and the Cardiac Cycle Topics ECG and Arrhythmias Continued Flutter Fibrillation Heart Block Bundle Branch Block The Electrical Axis of the Heart Definition of the Electrical Axis Diagnostic Uses of the Electrical Axis Calculating the Electrical Axis The Cardiac Cycle Opening and Closing of Heart Valves Heart Valve Disease Pressure and Volume Changes during the Cardiac Cycle Late Diastole (Ventricular Filling) Early Systole (Isovolumetric Contraction) Late Systole (Ventricular Ejection) Early Diastole (Iso
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