Cardiac Cycle Flashcards
1
Q
What are the 3 parts of the cardiac cycle?
A
1) Atrial systole
2) Ventricular systole
3) Diastole
2
Q
What is atrial systole?
A
Ventricles are relaxed and atria contract, this decreases their volume so increases the pressure which forces AV valves to open, and blood is pushed into the ventricles. Ventricular pressure increases slightly as they fill with blood
3
Q
What is ventricular systole?
A
Atria relax, the ventricles contract which decreases the volume and increases the pressure forcing the AV valves close. When pressure increases enough the SL valves are forced open and blood is pumped out through arteries
