Understanding the Corpus Luteum and Hormone Production

The question asks about the main hormone produced by the Corpus luteum in the ovary after ovulation. To answer this, we need to understand the menstrual cycle and the role of different structures within the ovary.

Following ovulation, the ruptured follicle in the ovary transforms into a temporary endocrine gland called the Corpus luteum. This structure plays a crucial role in the second half of the menstrual cycle, known as the luteal phase.

Hormone Production by the Corpus Luteum

The primary function of the Corpus luteum is to produce hormones that prepare the uterus for potential pregnancy and maintain it if conception occurs. The main hormone produced by the Corpus luteum is Progesterone.

• Progesterone: This hormone is vital for thickening the uterine lining (endometrium), making it suitable for the implantation of a fertilized egg. It also inhibits contractions of the uterus, preventing premature expulsion of a potential pregnancy. If pregnancy does not occur, the Corpus luteum degenerates, causing Progesterone levels to drop, which triggers menstruation.

Let's consider the other options:

• FSH (Follicle-Stimulating Hormone): Produced by the pituitary gland, FSH stimulates the growth and maturation of ovarian follicles. It acts before ovulation.
• LH (Luteinizing Hormone): Also produced by the pituitary gland, LH triggers ovulation and the formation of the Corpus luteum from the ruptured follicle. While it helps create the Corpus luteum, LH itself is not the main hormone *produced* by the Corpus luteum.
• hCG (human Chorionic Gonadotropin): This hormone is produced by the developing placenta after implantation. It signals the Corpus luteum to continue producing Progesterone, but it is not produced by the Corpus luteum itself.

Based on the roles of these hormones, Progesterone is the hormone mainly produced by the Corpus luteum following ovulation.