Atria
Receiving chambers of the heart
Ventricles
Discharging chambers of the heart
Tricuspid Valve
Valve separating the right atrium from the right ventricle
Bicuspid Valve
Valve separating the left atrium from the left ventricle
Chordae Tendinae
Stringlike structures that attach to the atrioventricular valves of the heart
Semilunar
Valve between a ventricle and an artery
Parietal Pericardium
Fibrous sac surrounding the heart
Myocardium
Muscle layer of the heart
Epicardium
Another term for the visceral pericardium
Endocardium
Innermost layer of the heart wall
Systole
Contraction of the heart muscle
Diastole
Relaxation of the heart muscle
Cardiac Cycle
Each complete heartbeat
Stroke Volume
Volume of blood ejected from the ventricle during each beat
Cardiac Output
Volume of blood pumped by one ventricle in 1 minute
SA Node
Pacemaker
Purkinje Fiber
Last structure in the heart conduction system; stimulates the ventricles to contract
P Wave
ECG tracing indicating depolarization of the atria
QRS Complex
ECG tracing indicating depolarization of the ventricles
T Wave
ECG tracing indicating repolarization of the ventricles
Artery
Blood vessels that carry blood away from the heart
Vein
Blood vessel that carries blood back to the heart
Capillary
Blood vessels that exchange substances between the blood and the tissues
Tunica Adventitia/Externa
Outermost layer of an artery or vein
Tunica Intima
Innermost layer of an artery or vein
Tunica Media
Muscle layer of an artery or vein
Ductus Arteriosus
Blood vessel that allows fetal blood to bypass the lungs
Ductus Venosus
Blood vessel that allows fetal blood to bypass the immature liver
Hepatic Portal System
Second capillary bed in the liver, containing blood coming from the digestive system
Pulse
Expanding and recoiling of an artery due to the force of blood
Right Atrium
Heart chamber into which blood from the superior vena cava enters
Right Ventricle
Blood passing though the tricuspid valve enters this chamber
Left Atrium
Chamber that blood from the pulmonary vein enters
Left Ventricle
Chamber that pushes blood through the aortic semilunar valve when contracted
Tricuspid Valve
Valve that blood in the right ventricle passes through
Mitral Valve
Valve that blood in the left ventricle passes through
Aortic Semilunar Valve
Valve that prevents blood from falling back into the left ventricle
Pulmonary Semilunar Valve
Valve that prevents blood from falling back into the right ventricle
Aorta
The left ventricle pushes blood into this blood vessel
Pulmonary Artery
Blood vessel into which blood in the right ventricle is pushed
Pulmonary Vein
Blood vessel that returns blood to the left atrium
Inferior Vena Cava
Blood vessel from which blood empties into the right atrium.