The circulatory system- the heart 0.0 / 5 ? BiologyThe circulatory system- the heart UniversityNone Created by: catCreated on: 15-04-14 13:32 There are three layers in the heart wall. name these and state what they are made of. epicardium-visceral layer. myocardium- cardiac muscle layer. endocardium- innermost layer of tissue that lines the hear, valves. 1 of 17 what is the pericardium made of? Dense irregular connective tissue. 2 of 17 state a few things about the cardiac muscle histology. cells are branched, contain intercalated discs with gap junctions, are involuntary,striated and have a single nucleus per cell 3 of 17 what are intercelated discs? the area where the ends of the cells are connected to another cell. They contain gap junctions, adhering junctions and desmosomes 4 of 17 what do gap junctions do? they allow muscle cells to be electrically coupled.so they beat in synchrony 5 of 17 what are the functions of desmosomes? they allow the depolarization of adjacent fibers.They are a type of cell junction. 6 of 17 what change causes the valves to open and close? pressure changes 7 of 17 Surrounding the values are dense connective rings which fuse and merge with the interventricular septum. state the funtion of the connective tissue to support heart valves, insertion point for cardiac muscle bundles and an electrical insulator between atria and ventricles 8 of 17 state the flow of electrical conductance. 1)SA-node 2)AV-node 3)Bundle of his 4) right and left bundles 5) purkinjie fibers 9 of 17 where is the nervous control of the cardiovascular system located? Medulla 10 of 17 what does the sympathetic impulse do? increases heart rate and force of contraction 11 of 17 what does the parasympathetic impulse do? decreases the heart rate. 12 of 17 what is systemic circulation? The flow of blood from the left side of the heart to the body and back 13 of 17 What is hepatic portal circulation? capillaries in GI tract to capillaries in liver 14 of 17 pulmonary circulation? right side of heart to lungs and back to heart. 15 of 17 fetal circulation fetal heart through umbilical cord to placenta and back 16 of 17 What are the four main divisions of the aorta? ascending aorta, arch of aorta, thoracic aorta and abdominal aorta 17 of 17
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