Cardiac Cycle

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Cardiac Cycle by Mind Map: Cardiac Cycle

1. “15.2” Hole's Human Anatomy and Physiology (c) 2016, 14e, Student Edition, Reinforced Binding, by David N. Shier, Mcgraw-Hill, 2015, pp. 560-573.

2. P Wave

2.1. Depolarization of atria in response to SA node

3. QRS Complex

3.1. Depolarization of ventricles, triggers main pumping contractions

4. ST Segment

4.1. Beginning of ventricle repolarization

5. T Wave

5.1. Ventricular repolarization

6. PR Interval

6.1. Delay of AV node to fill ventricles

7. Isovolumic Contraction

7.1. Ventricles begin to contract

7.1.1. Ventricle pressure is increased All valves are closed so no blood flows outside ventricles First heart sound is heard

8. Period of Ejection

8.1. Increased ventricle pressure

8.1.1. Opens pulmonary valve and aortic valve Blood empties from ventricles into pulmonary trunk and aorta

9. Isovolumic Relaxation

9.1. Relaxation of ventricles

9.1.1. Ventricle pressure decreases All heart valves close Second heart sound is heard

10. Passive Ventricular Filling

10.1. AV valves open

10.1.1. Blood flows passively from atria to ventricle

11. Active Ventricular Filling

11.1. Atria contract

11.1.1. Fills ventricles with blood

12. Blood Flow Through Heart

12.1. Venae cavae and sinus

12.1.1. Right atrium Right ventricle Pulmonary trunk