Final answer:
The hormone used to terminate unwanted early pregnancies is Mifepristone; it blocks the hormone progesterone that maintains the pregnancy. Progesterone is essential for gestation, inhibiting contractions and ensuring the pregnancy progresses.
Step-by-step explanation:
d) Mifepristone Termination of Early Pregnancy Hormone The hormone used to terminate unwanted early pregnancies is d) Mifepristone. Mifepristone, also known as RU-486, is an antiprogestogen which works primarily by blocking the hormone progesterone, needed to maintain a pregnancy. Without this hormone, the lining of the uterus breaks down as it does during a menstrual period and stops the growth of the pregnancy.Progesterone, mentioned in the context of maintaining pregnancies and preparing the endometrial lining, has a vital role in the continuation of pregnancy, as it suppresses uterine contractions to prevent preterm birth and supports the early stages of gestation.By contrast, estrogen, human chorionic gonadotropin (hCG).
The other hormones listed play various roles in both the establishment and maintenance of a pregnancy, but are not employed in medical procedures to terminate pregnancies.The hormone used to terminate unwanted early pregnancies is Mifepristone, which is a type of progesterone receptor antagonist. Mifepristone works by blocking the effects of progesterone, which is necessary for maintaining pregnancy. It is usually used in combination with another medication called misoprostol to safely and effectively terminate an early pregnancy.