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Unformatted text preview: early ventricular diastole o quiescent period: period of total heart relaxation (~0.4 sec. of total 0.8 sec. of cycle)- Heart sounds : lub-dup sound o AV valves close o SL valves close o Murmurs : sounds often indicative of valve problems- Cardiac output (CO) : CO = Stroke Volume (SV) x Heart Rate (HR) o normal resting values: SV = 70 ml/beat; HR = 75 beats/min; CO = 5250 ml/min SV = end diastolic volume (EDV) end systolic volume (ESV) Normal resting values: EDV = 120 ml; ESV = 50 ml o cardiac reserve: difference between resting & maximal CO o regulation of stroke volume: preload: degree of stretch of cardiac muscle cells just before contraction contractility: increase in contractile strength afterload: back pressure exerted by arterial blood PAGE4...
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- Fall '10