What is the main function of progesterone in the body?

Progesterone plays a crucial role in the female reproductive system, primarily in supporting the menstrual cycle and maintaining a healthy pregnancy. After ovulation, it is produced by the corpus luteum, which develops from the follicle that released the egg. This hormone prepares the uterine lining for a potential implantation of a fertilized egg, contributing to a suitable environment for fertilization and embryo development. If pregnancy occurs, progesterone levels remain elevated to sustain the uterine lining and prevent menstruation.

Additionally, progesterone helps balance the effects of estrogen and is involved in regulating ovulation and menstrual cycles. Its role in maintaining the phases of the menstrual cycle and supporting early pregnancy highlights its importance in female reproductive health.

In contrast, while other hormones may influence blood sugar levels, contribute to the stress response, or aid in muscle growth, progesterone's primary function is distinctly related to reproduction and pregnancy support. This specificity in its role distinguishes it from the other functions mentioned in the options.