3.What is the difference between diabetes mellitus and diabetes insipidus?
The word diabetes is an interesting one. Its origin is in the Greek language where it is derived from the word for a siphon or, more simply, a pipe or hose. This word was used to describe the disorder in ancient times (and diabetes was recognized in great antiquity) because those suffering from it produced such plentiful amounts of urine that they were reminiscent of a water pipe.
The reason for the plentiful amounts of urine lies in the fact that when the sugar glucose reaches excessively high levels in our bloodstream, it is filtered into the kidney and enters the urine in large quantities. Due to its chemical and physical properties, when large amounts of glucose are filtered by our kidneys into the urine, it cannot be fully reabsorbed and retains a large amount of water with it, thus creating very large volumes of urine.