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Pregnancy, prenatal period - Coggle Diagram

- - - - extraembryonic membranes
        
        yolk sac = blood cells
        
        amnion = umbilical blood vessels
        
        placental membrane = separates embryonic blood from meternal blood
        
        placenta = chorion contacts uterine wall
    - - gastrulation = single layer to 3 layer
      - organogesnesis = germ layers: ectoderm, mesoderm, endoderm
      - gastrula = has 3 germ layers
      - Fetal
        
        Fetal hemoglobin = carry 30% more O2
        
        umbilical vein = transprots O2 rich blood from placenta to fetus
        
        Ductus venosus = breaks off from umbilical vein
        
        foramen ovale = opening between the R & L atria in fetal heart
        
        Ductus arteriosus = blood from pulmonary trunk to aorta
        
        Parturition
        
        positive feedback
        
        milk production = receptors > colostrum > mature milk is ejected
        
        Postnatal period
        
        infancy > childhood > adolescence > adulthood > senescence > death
        
        preactive dying = 3 months
        
        active dying = 3 signs