BIOB34H3 Lecture Notes - Simple Squamous Epithelium, Pericardial Fluid, Serous Fluid
Document Summary
19. 5bde: anatomy of heart, pathway of blood through the heart. Pulmonary circuit: heart to lungs and back, gas exchange occurs in lungs (picks up o2, drops off co2, right side of heart is pump, short distance, low pressure circulation. Systemic circuit: heart to body tissues and back, gas exchange at tissues (drops off o2, picks up co2, left side of heart is pump, long distance, high resistance pathway, heart valves. Keep blood flowing in one direction only. Atrioventricular valves: ct covered with endothelium, attached to chordae tendinae (collagen cords) which attach to, papillary muscles, anchor valves, prevent opening backwards. Semilunar valves: ct covered with endothelium, shaped like cups so won"t open backwards, coronary circulation. Heart receives its blood supply from right and left coronary arteries: branches from ascending aorta, capillaries bring blood to tissues, veins carry blood back to the circulation via coronary sinus, which empties into right atrium.
