Graafian follicle of ovary secretes

Options

A. Estrogen
B. Relaxin.
C. Progesterone
D. Cortisone.

Answer

To answer the question "Graafian follicle of ovary secretes," we will analyze the functions and secretions of the Graafian follicle step by step.

### Step-by-Step Solution:

1. **Understanding the Graafian Follicle**:
- The Graafian follicle is a mature ovarian follicle that contains an oocyte (egg) and is involved in the female reproductive cycle.
- It is crucial for the process of ovulation, where the egg is released from the ovary.

**Hint**: Remember that the Graafian follicle is a key structure in the ovary that plays a role in ovulation.

2. **Hormonal Regulation**:
- The development of the Graafian follicle is stimulated by hormones, particularly Luteinizing Hormone (LH).
- LH promotes the maturation of the follicle and prepares it for ovulation.

**Hint**: Focus on the role of LH in the maturation of the Graafian follicle.

3. **Secretions of the Graafian Follicle**:
- The Graafian follicle primarily secretes hormones that are essential for the reproductive cycle.
- The main hormones secreted by the Graafian follicle are estrogen and progesterone.

**Hint**: Recall that the Graafian follicle is involved in the secretion of key reproductive hormones.

4. **Formation of Corpus Luteum**:
- After ovulation, the remnants of the Graafian follicle transform into the corpus luteum.
- The corpus luteum continues to secrete hormones, primarily progesterone and some estrogen, which are crucial for maintaining the uterine lining for potential implantation of a fertilized egg.

**Hint**: Understand the transition from the Graafian follicle to the corpus luteum and its significance in hormone production.

5. **Evaluating the Options**:
- Given the options:
1. Estrogen
2. Relaxin
3. Progesterone
4. Cortisone
- The correct answer is **Progesterone**, as it is one of the primary hormones secreted by the corpus luteum, which originates from the Graafian follicle.

**Hint**: Identify the main hormones associated with the Graafian follicle and corpus luteum to choose the correct answer.

### Final Answer:
The Graafian follicle of the ovary secretes **Progesterone**.