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.
Feedback Control of Hormone Production. Feedback circuits are at the root of most control mechanisms in physiology, and are particularly prominent in the endocrine system. Instances of positive feedback certainly occur, but negative feedback is much more common. Negative feedback is seen when the output of a pathway inhibits inputs to the pathway.