Anemia: A condition in which an abnormally low amount of hemoglobin or a
low number of red blood cells results in the body cells receiving too little
Aorta: An artery that conveys blood directly from the left ventricle of the
heart to other arteries. Arteriole: A vessel that conveys blood between an
artery and a capillary bed.
Artery: A vessel that carries blood away from the heart to other parts of the body.
Atherosclerosis: A cardiovascular disease in which fatty deposits called plaques
develop on the inner walls of the arteries, narrowing their inner diameters.
Atrioventricular (AV) Node: A region of specialized heart muscle tissue between
the left and right atria where electrical impulses are delayed for about 0.1 second
before spreading to both ventricles and causing them to contract.
Atrium: (plural, atria) A heart chamber that receives blood from the veins.
Blood: A type of connective tissue with a fluid matrix called plasma in which
blood cells are suspended. Blood Pressure: The force that blood exerts against
the walls of blood vessels.
Capillary: A microscopic blood vessel that conveys blood between an arteriole and
a venule; enables the exchange of nutrients and dissolved gases between the
blood and interstitial fluid.
Capillary Bed: One of the networks of capillaries that infiltrate every organ
and tissue in the body. Cardiac Cycle: The alternating contractions and
relaxations of the heart.
Cardiac Output: The volume of blood pumped per minute by each
ventricle of the heart. Cardiovascular Disease: Diseases of the heart
and blood vessels.
Cardiovascular System: A closed circulatory system with a heart and branching
network of arteries, capillaries, and veins
Circulatory System: The organ system that transports materials such as nutrients,
O2, and hormones to body cells and transports CO2 and other wastes from body
cells. Closed Circula