An important function of progesterone is:
1. prepare uterus for pregnency
2. implantation of embryo
3. maintainance of pregneny
4. stimulate ADH

Options

A. (A) and (B) are correct
B. (B) and (D) are correct
C. (A) and (C) are correct.
D. (A), (B) and (C) are correct.

Answer

To determine the important function of progesterone, let's analyze the options provided in the question step by step.

### Step 1: Understanding Progesterone
Progesterone is a hormone primarily produced by the corpus luteum in the ovaries after ovulation. It plays a crucial role in the female reproductive system.

### Step 2: Evaluating Each Option
1. **Prepare uterus for pregnancy**: Progesterone helps thicken the endometrial lining of the uterus, making it suitable for the implantation of a fertilized egg. This option is correct.

2. **Implantation of embryo**: While progesterone creates a favorable environment for implantation, it does not directly cause the implantation itself. This option is somewhat correct but not the primary function of progesterone.

3. **Maintenance of pregnancy**: Once implantation occurs, progesterone is essential for maintaining the pregnancy by preventing uterine contractions and supporting the developing embryo. This option is correct.

4. **Stimulate ADH**: Antidiuretic hormone (ADH) is produced by the posterior pituitary gland and is not influenced by progesterone. This option is incorrect.

### Step 3: Conclusion
Based on the analysis:
- The most important functions of progesterone are to prepare the uterus for pregnancy and to maintain pregnancy. Therefore, options 1 and 3 are correct.

### Final Answer
The important functions of progesterone are:
1. Prepare uterus for pregnancy (Correct)
3. Maintenance of pregnancy (Correct)