-PULMONARY CIRCUIT: right ventricle, pulmonary trunk, right and left pulmonary arteries, lobar branches repeated divisions, pulmonary arterioles, pulmonary capillaries, pulmonary Venules and veins, left atrium. Oxygen poor. Pulmonary Venules and veins are oxygen rich.
-SYSTEMIC CIRCUIT: left ventricle, aorta, all arteries and arterioles leading to body tissues, systemic capillaries, systemic Venules and veins, right atrium. Oxygen rich blood moves from left atrium to left ventricle
Cholesterol deposition in the blood vessels, narrowed coronary arteries, heart may shrink slightly or enlarge dye to disease, proportion of heart consisting of cardiac muscle declines, increase in fibrous connective tissue of the heart, increase in adipose tissue of the heart, heart valves and left ventricular wall may thicken, increase in systolic blood pressure, decrease in roasting heart rate, lumens of large Arteries narrow as arterial walls thicken, and decrease in arterial elasticity