The Cardiac Cycle

To the tune of "Radio Ga Ga" by Queen
In ventricular diastole
The ventricles fill passively
The AV valve is open so
Blood can continue to flow
Then comes atrial systole
The atrium will start to squeeze
The last remaining blood into
The ventricle for future use
The AV valve will finally close
When pressure in the ventricle
Rises above the atrium
Back flow not an option
Pressure rises, volume stays the same
It's the isovolumetric contraction phase
Cardiac cycling
Blood will flow from high to low pressure
High to low pressure
High to low pressure
Blood will flow from high to low pressure
High to low pressure
Physics and chemistry
Underly physiology
In ventricular systole
Blood in the heart will finally leave
The pressure is up high enough
The semilunar valves open up
Blood flows into the arteries
Ventricular pressure starts to decrease
The semilunar valves they close
Once again preventing back flow
Pressure falls, volume stays the same
It's the isovolumetric relaxation phase
Cardiac cycling
Blood will flow from high to low pressure
High to low pressure
High to low pressure
Blood will flow from high to low pressure
High to low pressure
Physics and chemistry
Underly physiology