Leydig cells secrete:

Question

Accepted Answer

The correct option is 2:

Leydig cells, also known as interstitial cells of Leydig, are endocrine cells found in the testes of males, located in the connective tissue surrounding the seminiferous tubules. Their primary and most crucial function is the production and secretion of androgens, the most significant of which is testosterone. This process is stimulated by Luteinizing Hormone (LH) released from the anterior pituitary gland. Testosterone is a vital hormone responsible for the development of male primary sexual characteristics (like the growth of reproductive organs), secondary sexual characteristics (such as facial hair, deepened voice, and muscle mass), and plays a significant role in spermatogenesis (sperm production), libido, and overall male reproductive health. Therefore, understanding the function of Leydig cells is fundamental to comprehending male reproductive physiology.

The incorrect option is 1: Progesterone. Progesterone is primarily a female sex hormone, mainly produced by the corpus luteum in the ovary after ovulation. While it has some roles in males, including as a precursor in steroid synthesis, it is not the primary hormone secreted by Leydig cells. Its main functions are related to the menstrual cycle and maintaining pregnancy.

The incorrect option is 3: Estrogen. Estrogen is predominantly a female sex hormone, primarily produced by the ovaries. Although small amounts of estrogen are present in males, largely produced through the conversion of androgens in other tissues, it is not directly secreted by Leydig cells as their primary product. Estrogen is crucial for the development of female secondary sexual characteristics and the regulation of the menstrual cycle.

The incorrect option is 4: Corticosterone. Corticosterone is a glucocorticoid hormone produced by the adrenal cortex. It is involved in stress response, metabolism, and immune regulation, and is not associated with the reproductive functions of Leydig cells.