Chapter 34 Human Cardiovascular Physiology

Chapter 34 Human Cardiovascular Physiology - Chapter 34...

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Chapter 34 Human cardiovascular physiology
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Cardiac cycle ¢ Concepts to memorize: ¢ The two atria contract simultaneously ¢ The two ventricles contract simultaneously ¢ Diastole l The relaxation period ¢ Systole l The contraction period
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Steps of the cardiac cycle ¢ The heart is in diastole l Heart pressure is low ¢ The blood flows passively from the pulmonary and systemic system into the atria ¢ The AV valves open ¢ The blood flows into the ventricles ¢ The atria contracts to force the residual blood into the ventricles
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Cardiac cycle ¢ The ventricular pressure increases ¢ The ventricular systole begins l The atria are in diastole and begin to be filled ¢ The AV valves close ¢ The semilunar valves open ¢ The blood flows into the aorta and the pulmonary arteries
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Cardiac cycle ¢ The pressure in the aorta and pulmonary arteries increase ¢ The semilunar valves close ¢ The ventricles relax
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The cardiac sounds (lub-dup pause) ¢ First heart sound (S1- lub) l Represents the closing of the AV valves l It happens at the beginning of the
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Chapter 34 Human Cardiovascular Physiology - Chapter 34...

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