located between the left atrium and left ventricle (D in the diagram)

located between the right atrium and right ventricle (A in diagram)

prevent valves from everting and allowing blood to flow backward

found at the base of the aorta and the pulmonary artery; prevent blood from flowing back into the ventricles (B & C in diagram)

inflammation caused by repeated bacterial infections of the heart muscle

vessels branching from the base of the aorta that serve to supply oxygen to the heart

drain the myocardium from oxygen-depleted blood

One of the most important parts of the intrinsic conduction system of the heart; located in the right atrium (#1 in diagram)

part of the intrinsic conduction system located between the atria and the ventricles (#2 in diagram)

lack of adequate blood supply to the heart muscle

a rapid, uncoordinated shuddering of the heart muscle

rapid heart rate (over 100 bpm)

sustained heartrate below 60 bpm

contraction of the heart muscle

relaxation of the heart muscle``

the amount of blood pumped out by each side of the heart in one minute