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DEV HEART (LO's: (Understand why a circulatory system is necessary,…

- - - - Branchial bulb pumps
  - - - 1 Ventricle
      - 2 Atria
  - - - Blood tends not to mix
        
        Atria contract seperately
  - - - Organisms can grow larger
      - Limited by fragility of lungs
        
        Double circulation solves issue
- - - - Looping occurs
        
        Wedging - atrium divides
        
        Septation - ventricles divide
        
        Division of outflow tract
        
        Alignment by endocardial cushions
        
        Neural crest cells
        
        Musclular septum with mesenchymal cap
        
        Septum primum > Septum secundum
- - - - Connecting umbilical vein to :
        
        Vena cafa
        
        Fetal liver
        
        Regulated by sphincter
  - - - Connecting pulmonary trunk to descending aorta
- - - - Ostia
        
        Pores
        
        Passage of Haemolymph
      - Tubular heart
      - Vessels