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PSIO 202, Lecture 7

PSIO 202, Lecture 7 - PSIO 202 Human Anatomy and Physiology...

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PSIO 202 PSIO 202 Human Anatomy and Physiology Human Anatomy and Physiology Lecture 7 The Heart; Mechanics and Cardiac Output
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Objectives and Reading Assignment • Reading: Tortora, pages 738-742 • Objectives – Discuss the relationship between pressure and volume in the heart chambers, as well as the position of the various heart valves, in both systole and diastole – Define cardiac output and know how to calculate it, given values for heart rate and stroke volume – Define and describe the major determinants of stroke volume, and the underlying mechanisms of each – Define the Frank-Starling mechanism
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Definition of Systole and Diastole Ventricular systole starts when the AV valves close and the pressure within the ventricles begins to rise as the cardiac muscle fibers are depolarized and then contract Ventricular diastole starts with ventricular muscle repolarization , leading to a drop in ventricular pressure, and filling of the ventricle • Atrial systole is very brief; thus, ventricular filling is largely passive
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Figure 17.18b
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