Interactive cardiac cycle

Heart in Motion

Drag to orbit, scroll or pinch to zoom. Tap any label or structure to learn what it does.

BP--/--mmHg

CO--L/min

EF--%

Heart rate72

Building the heartSculpting the chambers

Detail level

Cardiac cycle

Atrial systole

Ventricular systole

Diastole

Ventricular filling0 ms

Tricuspid open

Pulmonary closed

Mitral open

Aortic closed

Atrial systole Ventricular systole Diastole
Darker shades mark the isovolumetric phases, when all four valves are shut.

Playback

Heart rate 72 bpm

View

Cut plane 1.8 cm front

Space plays or pauses, or moves the tour on. Double-click the heart to reset the view.

Conduction

SA node

Legend

Oxygenated blood Deoxygenated blood Activation wavefront Depolarized muscle

Pressures, volumes and valve timing come from a small circulation model that runs alongside the animation. Shapes are simplified for clarity, so treat sizes as approximate.