DPT 712 EXAM 2: THE CARDIAC PUMP/CYCLE EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED

DPT 712 EXAM 2: THE CARDIAC PUMP/CYCLE EXAM

QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS

VERIFIED


cardiac output

amount of blood the heart pumps with each cycle

cardiac output equation

HR (bpm) x SV (mL) unit = mL/minute

cardiac cycle

.8 seconds

valves function

prevent backflow of blood

AV valves include

tricuspid and mirtal

semilunar valves inclue

pulmonary and aortic

AV valves open when

atrial pressure is greater than ventricular pressure

AV valves close when

ventricular pressure is greater than atrial pressure

semilunar valves are open when

ventricular pressure is greater than arterial/aortic pressure

, semilunar valves are closed when

arterial/aortic pressure is greater than ventricular pressure

4 phases of cardiac cycle

ventricular filling, isovolumetric contraction, ventricular ejection, isovolumetric relaxation

ventricular filling

LV is in diastole, atrial pressure greater than ventricular pressure; AV valves open,

blood flows from LA to LV

blood flow during ventricular filling

80% of blood moves passively from atria to ventricles due to pressure gradient

S3 sound

sound of 80% of the blood rapidly filling the ventricles

atrial kick/S4 sound

atria contracting to expel other 20% of blood from atria to ventricles

end diastolic volume (EDV)

amount of blood in ventricle after diastole

EDV after ventricular filling is

120 mL of blood

isovolumetric contraction

LV is systole, ventricular pressure is greater than arterial pressure (and rising!), AV

valves close

S1

"lubb", sound of AV valves closing during isovolumetric contraction

valves during isovolumetric contraction