MEDICAL PHYSIOLOGY

Detailed explanation-1: -Testosterone is secreted by cells that lie between the seminiferous tubules, known as the Leydig cells. The testes also produce inhibin B and anti-Müllerian hormone from Sertoli cells, and insulin-like peptide 3 (INSL3) and oestradiol from the Leydig cells.

Detailed explanation-2: -Testosterone is the key male sex hormone that regulates fertility, muscle mass, fat distribution, and red blood cell production. When levels of testosterone drop below levels that are healthy, they can lead to conditions like hypogonadism or infertility.

Detailed explanation-3: -Function: Testosterone is involved in the development of the male secondary sex characteristics such as facial hair, pubic hair, increased muscular build, deep voice, etc. It is involved in increasing the protein synthesis in muscles thereby increasing the muscle mass in males.