Cardiac Cycle Flashcards
What is the first stage of the cardiac cycle
Late diastole
What happens in the late diastole phase
Both chambers are relaxed, blood fills down the atria into ventricles
Which stage happens after late diastole and what happens
Atrial systole.
Atria contract and push more blood into the ventricles
What happens after the atria systole
Isovolumic ventricular contraction
AV valves shut as pressure build in ventricles and it contracts
What is the largest volume in the ventricle called (after atrial systole and during isovolumic ventricle contraction)
End diastolic volume
Why aren’t the SL valves open at the isovolumic ventricle contraction phase
Pressure isn’t large enough in ventricle yet
What happens after isovolumic ventricle contraction
Ventricular ejection
SL valves open and blood is ejected into arteries via more ventricular contraction
What happens after ventricular ejection
Isovolumic ventricular relaxation
Ventricles relax and SL valves shut
What is the minimum volume called in ventricle at the isovolumic relaxation stage
End systolic volume
Which valves are shut at the isovolumic ventricular relaxation phase
Both SL and AV to stop flow into ventricle (end systolic volume)
When do AV valves reopen again
Late diastole phase when ventricular pressure is lower than atrial pressure
What does the P wave on ecg represent in the cardiac cycle
Atrial systole to fill the ventricles
What does the QRS complex represent in the cardiac cycle
Isovolumic ventricular contraction
AND further into ventricular ejection phase
What does the T wave repolarisation represent in the cardiac cycle
Isovolumic ventricular relaxation
What do the 2 sounds represent
1- AV shut at the isovolumic ventricular contraction phase
2- SL valves shut at the isovolumic ventricular relaxation phase
