Systole		Oxygen enters the capillaries of the lungs and is brought back to the heart via these
Right Atrium		Abnormal heart sound
Electrocardiogram		Contraction phase of heartbeat
Murmur		Seperates the two upper chambers of the heart
Mitral Valve		The left ventricle propels the blood through this
Inferior Ven Cava		Right ventricle contracts to pump oxygen-poor bkiid through this
Superior Vena Cava		Right atrium contracts to force blood through this
Pulmonary Veins		Record used to detect electrical changes in heart muscle as the heart beats
Diastole		Surrounds the heart
Interatrial Septum		Pacemaker of heart
Tricuspid Valve		Also known as bundle of His
Pulmonary Artery		lower right chamber of the heart
Aortic Valve		The walls of the left atrium contract to force blood through this
Myocardium		A muscular wall, comes between the two lower chambers
Right Ventricle		Drains blood from the upper portion of the body
Atrioventricular Bundle		Has the thisckest walls of all four heart chambers
Sinoatrial Node		Relaxation phase of heartbeat
Pericardium		Middle muscular layer of the heart wall, thickest layer
Left Atrium		Newly oxygenated blood enters this to go through the heart
Endocardium		Carries blood from the lower part of the body
Aorta		Branches to carry blood all over the body
Pulmonary Valve		Lines the interior of the heart and heart valves
Interventricular Septum		Thin walled upper right chamber of the heart, sends low oxygen blood to lungs
Left Ventricle		Blood leaving the pulmonary valve flows into this