lecture 3

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University of Toronto Scarborough
Biological Sciences
Ivana Stehlik

Cardiovascular system The HeartObjectivesAfter the series of lectures on this topic the students should be able to1 Discuss the membrane potential ion channels and pumps of the heart2 Discuss the electrophysiology of cardiac muscle and the origin of the heart beat3 Describe the physiology of cardiac muscle contraction4 Describe the conducting system of the heart5 State the differences between slow and fast channels in cardiac muscle and describe action potentials in cardiac muscle6 Explain the importance of the refractory period in cardiac muscle7 Explain the various components of the cardiac cycle including systole diastole and heart sounds8 Define cardiac output CO and describe the factors that affect it9 Explain the various features of an electrocardiogram ECG and the events that those features reflect10 Define the term autorhythmicity and explain how the sinoatrial SA node functions as the pacemaker11 Explain how heart rate is regulated12 Describe the differences between sympathetic and parasympathetic stimulation of heart function 13 Explain heart failure and its compensatory mechanisms
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