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Pregnancy

QuestionAnswer
Embryo reaches uterus 6-7 days after fertilization First Trimester
Mother and baby's blood come close in proximity, but never mix. Gases exchanged First
Somites are evident; blood vessels and gut have begun to develop First
Eyes form; Tubular heart develop four chamber and starts to pulsate rhythmically First
Arms, legs, knees, elbosws, fingers, and toes can be seen as well as short bony tail (coccyx) First
Major organs in abdominal cavity become evident (liver, pancreas, gall bladder) First
Ninth week marks transition from embryo to fetus First
All major organs of body have been established in proper location First
Nervous system develops First
Embryo begins to show facial expressions; sucking and startle reflexes are carried out First
Bones enlarge Second
Baby starts kicking Second
Heartbeat can be detected with stethescope Second
Period of growth and organ maturation Third
Most major nerve tracts develop in the brain, as well as new neurons Third
Created by: lindzx92
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