Atria - upper two chambers of the heart.
Ventricles - lower two chambers of the heart.
Heart Anatomy: Heart Wall
Epicardium - the outer layer of the wall of the heart.
Myocardium - the muscular middle layer of the wall of the heart. Endocardium - the inner layer of the heart.
Heart Anatomy: Cardiac Conduction
Cardiac Conduction is the rate at which the heart conducts electrical impulses. The following structures play an important role in causing the heart to contract:
Atrioventricular Bundle - bundle of fibers that carry cardiac impulses. Atrioventricular Node - a section of nodal tissue that delays and relays cardiac impulses. Purkinje Fibers - fiber branches that extend from the atrioventricular bundle. Sinoatrial Node - a section of nodal tissue that sets the rate of contraction for the heart.
Heart Anatomy: Cardiac Cycle
The Cardiac Cycle is the sequence of events that occurs when the heart beats. Below are the two phases of the cardiac cycle:
Diastole Phase - the heart ventricles are relaxed and the heart fills with blood. Systole Phase - the ventricles contract and pump blood to the arteries.
Heart Anatomy: Valves
Heart valves are flap-like structures that allow blood to flow in one direction. Below are the four valves of the heart:
Aortic Valve - prevents the back flow of blood as it is pumped from the left ventricle to the aorta. Mitral Valve - prevents the...