Embroyric Movements

• As pregnancy continues, membranes form that nourish and protect the developing embryo
• the membrane the amnion, becomes filled with fluid and its the amniotic sac.
• The amniotic sac contains the embryo within the uterus and protect it from sudden temperature changes.
• The amniotic sac surrounds the embryo until birth.
• The membrane the chorion begins to form.
• The chorion helps to nourish the embryo as it develops.
• The outer surface of the chorion has small projections called chorionic bill that extend into uterine lining
• Together the chorionic villi and the lining of the uterus form an important organ called the placenta
• The placenta connects the mother and embryo to allow for the exchange of oxygen, nutrients, and wastes between them.
• The umbilical cord, consists of two arteries and a vein that are twisted together.
• The umbilical cord connects the embryo inside the amniotic sac to the placenta.
• The nutrients and oxygen from the mothers blood diffuses into the chorionic villi, which contain blood from the embryo.
• Nutrients are carried to the embryo along the umbilical cord
• Wastes from the embryo diffuse into the mothers blood and are excreted in her urine.
• The blood flows of the mother and the embryo move past each other but they never mix.
• The placenta keeps the two flows separated.
• If protein from the embryo leaked into the mothers circulatory system, they could be detected as foreign invaders by the mothers immune system, the mothers system would then attack the proteins, which could end the pregnancy.
• The placenta provides a protective barrier for the mother embryo as it develops