Figure 1424

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Divisions of the cardiac cycle: (a) systole; (b) diastole. For simplicity, only one atrium and ventricle are shown. The phases of the cycle are identical in both halves of the heart. The direction in which the pressure difference favors flow is denoted by an arrow; note, however, that flow, although favored by a pressure difference, will not actually occur if a valve prevents it. % ^

PART THREE Coordinated Body Functions

Vander et al.: Human Physiology: The Mechanism of Body Function, Eighth Edition

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Vander Cardiac Cycle

Heart sounds

Aortic pressure

Left atrial pressure Left ventricular pressure

Left ventricular volume

Position of AV Valves Position of aortic and pulmonary valves

- Phase of cardiac cycle

1 = Ventricular filling

2 = Isovolumetric ventricular contraction

3 = Ventricular ejection

4 = Isovolumetric ventricular relaxation

Heart sounds

Aortic pressure

Left atrial pressure Left ventricular pressure

Left ventricular volume

Position of AV Valves Position of aortic and pulmonary valves

- Phase of cardiac cycle

1 = Ventricular filling

2 = Isovolumetric ventricular contraction

3 = Ventricular ejection

4 = Isovolumetric ventricular relaxation

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