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Myocardial infraction (chambers (right atrium (veins that empties in…

- - - - superior vena cava
      - inferior vena cava
      - coronary sinus
- - - - right ventricle
        
        pulmonary semilunar valve
        
        pulmonary trunk
        
        pulmonary artries
        
        l(oxygen poor blood)ungs
  - - - left ventricle
        
        aortic semilunar valve
        
        aorta
        
        systematic circulation
- - - - prevent backflow into atria
      - tricuspid valve
        
        btw right atria and ventricle
      - bicuspid valve
        
        btw left atria and left ventricle
    - - prevent backflow into ventricles
        
        each valve consist of three cups
        
        pulmonary semilunar valve
        
        btw right ventricle and pulmonary trunk
        
        pulmonary aortic valve
        
        btw left ventricle and aorta
        
        venticles contacts , blood pressure opens valves
        
        ventricles relax ,
        
        interaventricular pressure drops
        
        valves closes
- - - - aortic pulmonary valves closes
- - - - PRELOAD
      - AFTER LOAD
      - CONTRACTILITY