cardiac cycle Flashcards
whats the first step of the cardiac cycle?
late diastole
both sets of chambers are relaxed and ventricles fill passsivly
whats the second step of cardiac cycle?
atrial systole
atrial contraction forces a small amount of additional blood into ventricles
whats the third stage of cardiac cycle
isovolumic ventricular contraction
first phase of ventricular contraction pushes AV valves closed but does not create enough pressure to open semilunar valves
what is the fourth stage of cardiac cycle?
ventricular ejection
as ventricular pressure rises and exceeds pressure in the arteries, the semilunar valves open and blood is ejected
what is the final stage of cardiac cycle?
isovolumic ventricular relaxation
as ventricles relax, pressure in ventricles falls, blood flows back into cusps of semilunar valves and snaps them closed
what is a phonocardiogram
a chart or record of the sounds made by the heart
what are the first lines seen on a phonocardiogram
Mitral & tricuspid
valves closing
what are the second lines seen on a phonocardiogram
Stenosis of aortic/pulmonary or
Regurgitation through mitral/tricuspid
what is the third lines seen on a phonocardiogram
Aortic &
pulmonary
valves closing
whats the last continous line seen on the phonocardiogram?
Stenosis of mitral/tricuspid or
Regurgitation through aortic/pulmonary
systolic pressure
pressure your heart exerts while beating
diastolic pressure
amount of pressure in your arteries between beats
mean arterial pressure
calculates mean arterial pressure from measured systolic and diastolic blood pressure values.
end diastolic volume
volume of blood in the right and/or left ventricle at end load or filling in (diastole) or the amount of blood in the ventricles just before systole.
end systolic volume
is the volume of blood in a ventricle at the end of contraction, or systole, and the beginning of filling, or diastole. ESV is the lowest volume of blood in the ventricle at any point in the cardiac cycle.
