Systole Phases + Conduction System

• Diastole phase is when the atria fills with blood and the valves are close
• Atrial systole phase is when the atria contracts and blood moves to ventricles
• Ventricular systole phase is when the ventricles contract and blood moves into the aorta and pulmonary artier to the rest of the body and lungs
• Phase 1) diastole phase stimulates the SA node
• Phase 2) The AV node is triggered and arterial systole phase begins
• Phase 3) bundle of his is stimulated and then messages is sent to the right and left bundle branches
• Phase 4) message moves to the left and right purkinje fibres and then the ventricular systole phase occurs