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bio sf - CirculationII/Muscles flow cycle TheCardiacCycle...

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Circulation II/Muscles
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The Circulatory System Last week – focused on the path of blood  flow How does this determine  the cardiac  cycle ?
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The Cardiac Cycle Contraction of the two atria, followed by  contraction of the two ventricles and then  relaxation is the cardiac cycle Divided into two phases:  Systole – when the ventricles contract Diastole – when the ventricles relax
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The “Lub-Dup” Sounds of the cardiac cycle that are  created by the heart valves slamming  shut. Lub – As the ventricles begin to contract,  pressure in them rises above the pressure  in the atria, so the AV valves close. Dup – As the ventricles relax, high  pressure in aorta and pulmonary artery  closes the aortic and pulmonary valves.
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Measures of Cardiac Health Pulse – during systole, the pressure wave  created by contraction of left ventricle surges  through the arteries of your arms Blood pressure – Figure 50.4
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