Galileo Galilei was a physicist, an astronomer, and a mathematician. He improved the telescope, and was the first person to use it to study the skies. He was the first to see the four moons of Jupiter and the first to discover the rings of Saturn. he invented the rings of saturn and he dicoverd the comuter.xx happy reading.e improved the telescope, and was the first person to use it to study the skies. He was the first to see the four moons of Jupiter and the first to discover the rings of Saturn. he invented the rings of saturn and he dicoverd the comuter. xx happy reading.
In male mammals, a double negative feedback loop has evolved allowing separate regulation of testosterone biosynthesis and sperm production. A dual system allows an organism to better conserve energy while still remaining optimally functional.
Hypogonadism, also known as Low Testosterone, can be caused by certain medical conditions that create a problem with the testes and/or parts of the brain that regulate the testes. Testosterone levels between 300 ng/dL and 1000 ng/dL are generally considered in the normal range. The brain and the testes work together to keep testosterone in this range. When levels of testosterone are below the normal range, the brain signals the testes to make more. When there is enough testosterone, the brain signals the testes to make less. Only your doctor can determine if you have an underlying medical condition that is causing your testosterone levels to remain too low.