Cardiac Diagram. The lower two chambers of the heart are called ventricles. To achieve this high output efficiently the heart works through a carefully controlled sequence with every heartbeat this sequence of events is known as the cardiac cycle.
The middle layer of the heart wall is called myocardium. The heart wall is made up of three layers. During b atrial systole the atria contract pushing blood into the ventricles.
Blue arrows deoxygenated blood.
There are two phases of the cardiac cycle. The atrial systole ventricular diastole ventricular systole and ventricular diastole are clearly mentioned in the cardiac cycle diagram given below. The cardiac electrical signal controls the heartbeat in two ways. Cardiac muscle anatomy and function diagram.