What is the structure in the ovary that secretes mainly progesterone?

Step-by-step solution

Females have a pair of ovaries located in the abdomen (Figure 19.1). Ovary is the primary female sex organ which produces one ovum during each menstrual cycle. In addition, ovary also produces two groups of steroid hormones called estrogen and progesterone. Ovary is composed of ovarian follicles and stromal tissues. The estrogen is synthesised and secreted mainly by the growing ovarian follicles . After ovulation, the ruptured follicle is converted to a structure called corpus luteum, which secretes mainly progeste