What organ does a mother create during pregnancy?

The placenta is an organ that a mother creates during pregnancy, serving as a critical interface between the mother and the developing fetus. It is formed from the cells of the embryo and the lining of the uterus, and it plays a vital role in supporting fetal development. The placenta facilitates the exchange of oxygen and nutrients from maternal blood to the fetus while also removing waste products from the fetal circulation. It produces hormones that help maintain the pregnancy and supports various functions such as immune protection for the fetus.

In contrast, the uterus is an organ that is already present before pregnancy and simply supports the growth of the fetus. The amniotic sac is a protective liquid-filled sac that surrounds the fetus during pregnancy, but it is not considered an organ created by the mother. Ovaries are also existing organs involved in hormone production and ovum storage, but they do not form during pregnancy. Understanding the unique function of the placenta highlights its crucial role in the successful progression of pregnancy and fetal health.