Question: A prenatal nurse is conducting a class on healthy pregnancy and explains the role of placental hormones. Which statements would the nurse make? Need Assignment Help? Select all that apply. Estrogen causes enlargement of a pregnant parent's breasts. Relaxin causes enlargement of a pregnant parent's breasts, uterus, and external genitalia. Progesterone stimulates pregnant parent metabolism and breast development. Human chorionic gonadotropin is the basis for pregnancy tests. Human placental lactogen participates in the development of breasts for lactation. Thyroxin modulates fetal and pregnant parent metabolism.