The testes in male mammals descend into the scrotal sac because
Answer Details
The testes are the male reproductive organs responsible for producing sperm and the male hormone testosterone. In mammals, including humans, the testes initially form inside the abdomen, near the kidneys. However, for the production of healthy sperm, the testes need to be maintained at a temperature lower than the normal body temperature. Hence, during fetal development, a structure called the gubernaculum begins to pull the testes down towards the scrotal sac. As the testes move down, they are accompanied by blood vessels, nerves, and a duct called the vas deferens, which carry sperm from the testes to the urethra. Once the testes reach the scrotal sac, they are positioned outside the body, where the temperature is lower than the body temperature. This helps to keep the testes cool, which is important for the production of healthy sperm. Therefore, the testes in male mammals descend into the scrotal sac to maintain a relatively low temperature that is optimal for the production of healthy sperm.