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Human Body Circulatory system (Vascular system) Science Topic: Blood circulation:in this topic we will look at blood circulation (cardial vascular system). The flow of blood around the body is called, blood circulation. Some of the terms associated with this topic are: cardiac, Heart, Blood, Blood Vessels,valves, veins,erythrocytes, leucocytes, phagocytes, lymphocytes. Definition of the terms above: 1:cardiac is the muscle which makes up the thick middle layer of the heart. 2:Heart: This is a cardial muscular organ that pumps blood through the body of a vertebrate animal by contracting and relaxing. 3: Blood: this is the medium by which all substances are transported around the body. 4: Blood Vessels. the channels or conduits through which blood is distributed to body tissues. 5: valves:flaps (leaflets) that act as one-way inlets for blood coming into a ventricle and one-way outlets for blood leaving a ventricle.