Wednesday, 7 September 2011

3.11 Placenta

Describe the role of the placenta in the nutrition of the developing embryo

In the picture we can see a developing embyro:

When the child is in the uterus it is surrounded by amniotic fluid at this time the child cannot digest and can't breath but is also not adequate able to excrete. The child obtains nutrition by the umbilical cord of the placental structure growing out of the embryo. The placental structure connects the maternal blood vessel to the child's blood vessel, placenta biologically grows out of a developing embryo but also does not grow out of the mother. The blood vessels inside the placenta are the child's placenta including artery and the vein. The placenta grows into the wall of the Uterus of the mother. During pregnancy, the mother continues to eat which means that there will be amino acids, glucose and fats in the blood which will travel through her blood stream, to the placenta and then through to the embryo. The placenta has a large surface area and the barrier is really thin to allow an adequate area for exchange between the mother's blood and the baby's blood. The baby, produces molecules back to the mother, which is things like carbon dioxide and urea.

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