the cardiac layer muscle layer of the heart wall.
the membranous sac enveloping the heart.
carries blood away from the right ventricle and into the lungs.
system of blood vessels that carry blood toand from the lungs for gas exchange.
Pulmonary Semilunar Valve
heart valve opening from the right ventricle to the pulmonary artery.
deliver oxygen rich blood from the lungs to the left atrium.
SA node (Sinoatrial node)
the mass of specialized myocardial cells in the wall of the right atrium; pacemaker of the heart.
valves that prevent blood return to the ventricles after contraction.
Superior and Inferior Vena Cavae
largest veins in the body and carrie deoxyiginated blood to the heart.
system of blood vessels that carries nutrient and oxygen-rich blood to all body organs.
the contraction phase of the heart.
abnormally rapid heartbeat (over 100 beats per minute).
valve between the right atrium and the right ventricle.
outermost layer of a blood vessel which connects it to surrounding tissues.
the innermost layer of a blood vessel.
middle layer of artery; made up of smooth muscle fibers and thick layer of elastic connective tissue.
flaps of tissue that open and close to allow the flow of blood in one direction only. The heart's valves are located at the entrances and exits of its chambers.
blood vessels that carry blood back to the heart.
the two lower chambers of the heart, and they pump blood out to the lungs and body.
smallest vessels that gather blood from the capillaries into the veins.