Final answer:
Oxytocin and estrogen are both hormones involved in positive feedback loops connected to reproductive processes, such as childbirth and ovulation, respectively.
Step-by-step explanation:
Oxytocin is a hormone that is frequently involved with reproductive processes and is also part of a positive feedback loop during childbirth. During labor, the initial release of oxytocin causes uterine muscles to contract, which pushes the fetus towards the cervix, leading to its stretching. This stretching signals the pituitary gland to release more oxytocin, which intensifies the contractions. This loop continues until the birth of the child when oxytocin levels decrease.
Another hormone involved in a positive feedback loop is estrogen. When only one dominant follicle remains in the ovary, it secretes high levels of estrogen. These high levels of estrogen prompt the anterior pituitary to release large amounts of Luteinizing Hormone (LH) and Follicle-Stimulating Hormone (FSH), further increasing estrogen production. This positive feedback loop is critical for ovulation.