Progesterone as the Anti-Abortion Hormone:
Progesterone is known as the anti-abortion hormone because of its crucial role in maintaining pregnancy and preventing the uterus from contracting. Here is why progesterone is considered as the anti-abortion hormone:

1. Role in Pregnancy:
- Progesterone is a hormone produced by the ovaries after ovulation.
- It prepares the uterine lining for implantation of a fertilized egg.
- It helps in maintaining the uterine lining throughout pregnancy, providing a suitable environment for the developing fetus.

2. Inhibits Uterine Contractions:
- Progesterone plays a vital role in preventing the uterus from contracting.
- During pregnancy, the uterus needs to remain relaxed to avoid premature labor and miscarriage.
- Progesterone blocks the action of certain hormones that trigger contractions in the uterus.

3. Importance in Early Pregnancy:
- In the early stages of pregnancy, progesterone levels are crucial for the survival of the developing embryo.
- It helps support the growth of the placenta, which is essential for providing nutrients and oxygen to the fetus.

4. Decline Leads to Abortion:
- If progesterone levels drop too early or too low during pregnancy, it can lead to miscarriage or abortion.
- This decline can trigger contractions in the uterus and cause the expulsion of the developing fetus.
In conclusion, progesterone is rightly referred to as the anti-abortion hormone due to its pivotal role in supporting and maintaining pregnancy. Its ability to prevent uterine contractions and provide a suitable environment for the developing fetus makes it essential for a successful pregnancy outcome.