Station 3: Getting Nutrients

Diffusion The diffusion is the process by which gases and other small molecules move from a high concentration of that particular molecule to an area of lower concentration of the same molecule. The purpose of diffusion: to make sure there is a balance of gases and other molecules in and outside of the cell. Why?: This balance ensures that processes such as fetal development occur the way that they should

The Placenta An organ that connects the fetus to the uterine wall. The fetus is attached to the placenta via the umbilical cord Job of the Placenta: To transfer nutrients and O2 from the mother’s blood into the blood of the fetus. How does this happen? Through the process of diffusion

Number 2= Umbilical cord Number 5= Placenta Number 3= Uterine Wall The placenta provides the nourishment for the developing fetus. Number 2= Umbilical cord Number 5= Placenta Number 3= Uterine Wall

If blood is separate, how do substances pass from mom to embryo If blood is separate, how do substances pass from mom to embryo? Through the process of diffusion. As you can see in the diagram, the oxygen from the mother’s blood will diffuse into the blood of the embryo going from high to low concentration. The mother’s blood will always have higher concentrations of oxygen; therefore, oxygen will continue to diffuse from the mother to her unborn child.

Nutrients in the form of proteins, carbohydrates, fats and many other types of molecules are being diffused through the placenta from mother to fetus. Additionally, the mother is receiving from the fetus mostly waste to dispose of.

This is a picture of an actual placenta with a portion of the umbilical cord attached. Fun Fact: Some women eat their placenta after giving birth. Why do you think that is?