cardiac cycle

1 cardiac cycle

Atrial systole atrium contract pushing blood into ventricles

2 cardiac cycle

Isovolumetric contraction ventricles contact av valves close

3 cardiac cycle

Rapid Ventricular ejection pressure in ventricles higher than aorta and pulmonary artery semilunar valves open

4 cardiac cycle

Isovolumteirc relaxation semilunar valves close

5 cardiac

Rapid ventricular filling pressure inside ventricles lower ghan atrium causing av valves to open

6 cardiac cycle

Diastasis ventricular filling slows ready for the next isolvumetrjc contraction.

P wave

atrial depolarisation

Qrs

Ventricular depolarisation

T wave

Ventricular repolarization

1 cardiac conduction

Sa node

2 conduction system

Av node

3 conduction system

Bundle of his

4 conduction system

purkinje fibres