Cardiodynamics and the Cardiac Cycle Flashcards
What does systole mean?
Stressed - period of contraction
What does diastole mean?
Relaxed - period of relaxation
What is the cardiac cycle?
The period between the start of one heartbeat and the start of the next
What is happening during the cardiac cycle?
Its alternating cycles of contraction and relaxation
What does it mean when a part of the heart is systole?
It’s emptying
What does it mean when a part of the heart is diastole?
Its filling
How does blood flow from one area to another?
Flows from an area of high pressure to an area of low pressure
What happens during atrial diastole?
The atria and the ventricles fill up with blood
What happens during atrial systole?
The ventricles are topped up with blood
What happens to 70% of the blood that enters the heart?
It goes straight down to the ventricles
Why are the atrial walls thinner then the ventricle walls?
They are only pumping the blood a small distance - also a small volume
What has to open for blood to be pumped from the atria to the ventricles?
The AV valve
What is End Diastolic Volume (EDV)?
2
At the end of atrial systole each ventricle holds a volume which it will hold for the length of the cardiac cycle
Volume in ventricle at end of atrial systole
What is stroke volume?
The volume ejected from the ventricles
What is end systolic volume?
The volume of blood left in the ventricle following contraction
