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.
In both men and women, testosterone is made in small amounts by the adrenal glands, and in women, by the ovaries. The pituitary gland controls the level of testosterone in the body. When the testosterone level is low, the pituitary gland releases a hormone called luteinizing hormone (LH) .This hormone tells the testicles to make more testosterone. Before puberty, the testosterone level in boys is normally low. testosterone test is done to: 1  See why a man is having problems in fathering a child (infertility). 2  A low amount of testosterone can lead to low sperm counts. 3  Check a man's sexual problems. 4  Having a low level of testosterone may lower a man's sex drive or not allow him to have an erection (erectile dysfunction).