For 10 points, name this organ which secretes human chorionic gonadotropin and is derived from maternal and fetal tissue.
This structure's evolutionary origins may lie in the relatively recent horizontal gene transfer of a pair of retroviral env proteins, known as syncytin-1 and syncytin-2 in humans. The Tenney-Parker change is a pathological finding in this structure of unusually high numbers of syncytial knots. Taxa are classified as eutherian based on whether or not they possess, or are extinct ancestors of species that possess this structure. Hofbauer cells are a type of macrophage that participates in vertical transmission in it. In this structure, the septa formed by incursions of the decidua basalis approach, but do not fully connect to, the chorionic plate. Inadequate perfusion of this organ is thought to be a cause of pre-eclampsia, a condition that can only be cured by removing this villous organ. For 10 points, name this organ which secretes human chorionic gonadotropin and is derived from maternal and fetal tissue.
This structure's evolutionary origins may lie in the relatively recent horizontal gene transfer of a pair of retroviral env proteins, known as syncytin-1 and syncytin-2 in humans.
placenta