Cardiac Cycle Flashcards
cardiac output
amount of blood pumped by heart per minute
stroke volume
amount of blood pumped by heart per systolic contraction
end diastolic volume
amount of blood in right/left ventricle after diastolic filling
end systolic volume
amount of blood in right/left ventricle after systolic contraction
ejection fraction
percentage of blood leving heart per beat (SV/EDV)*100
inotropy
chronotropy
relating to cardiac contractility
relating to heart rate
electrical conductance
starts in atria by SAN
goes to AVN to delay signal
goes down bundle of his
goes up purkinje tissue
and back down ventrical wall
atrial contraction then ventricle contraction
atrial systole
ventricular systole
diastole
blood pushed into ventricles
blood pushed into arteries
everything relaxes, blood passivly moves into ventricles
Equation for Ejection fraction
EDV-ESV= SV
SV/EDV = EF
order of events
atrial systole
isovolumetric contraction
rapid ejection
slow ejection
isovolumetric relaxation
rapid passive filling
slow passive filling
atrial systole
contributes <20% os SV
to push last bit of blood into ventricle from atrium
4th heart sound- abnormal
isovolumetric contraction
period between AV valves closing and semi-lunar valves opening
1st heart sound
mitral valve closes first
no volume change
rapid ejection
ventricles contract
ventrical pressure> aorta+artery pressure
blood pushed out of ventricle into arteries
reduced ejection
end of systole
semi lunar valves close
ventricular volume decreases slower
ventricle pressure<artery pressure
isovolumetric relaxation
atrial pressure rises as it fills
2nd heart sound
