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5_1_07 - Cardio-Vascular System Tuesday 9:33 AM Cardiac...

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Cardio-Vascular System Tuesday, May 01, 2007 9:33 AM Cardiac cycle Blood vessels Mean arterial Blood pressure control Hypo & hyper tension Blood Plasma Formed elements Heart valves operate because of pressure differentials Systole = contraction Diastole = relax Review fig 33.12 Cardiac cycle Review fig 42.6 Cardiac cycle timing Ventricles are in contraction about 1/3 of the time Know formula CO = SV x HR CO = cardiac output: ~ 5 L/min SV= Stroke volume: 70-80 ml/beat HR = heart rate: approx 70 bpm Blood pressure See fig 42.11 Interrelationship of blood flow velocity and blood pressure Blood vessels Arteries / veins/ venules a. conduction vessels b.Blood reservoirs Arterioles= conduction vessels a.Control blood flow to specific capillary beds 1. Precapillary sphincters (smooth muscle under hormonal and nervous system control)
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b.Control Mean Arterial Blood Pressure (MAP) 1. MAP= average blood pressure in the entire closed cardiovascular system Pulse pressure = systole - diastole ΔP = ΔV/compliance of arteries a.Deproduction stroke volume b.Ejection speed
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