Difference between diabetes mellitus and diabetes inspidus ?

Diabetes mellitus is a chronic medical condition related to the body's inability to properly maintain blood glucose levels. This is sometimes referred to as "sugar diabetes". Untreated sugar diabetes will result in excessive urination (polyuria) as the body's kidney try to filter excess glucose out of the blood. To counteract polyuria, the body will often exhibit excessive thirst (polydipsia).

Diabetes insipidus is a chronic medical condition related to the body's inability to maintain urinary control. This disorder that results in the body producing excessive amounts of urine (polyuria) and is often characterized by excessive thirst (polydipsia).

People that have mellitus will not experience polyuria if glucose levels are properly maintained as the kidney will not filter excess blood glucose levels. However, people that have insipidus will have urinary control problems, including polyuria, due to insufficient (or inaccessible) anti-diuretic hormone (ADH) that does not return to the bloodstream to prevent additional urinary demands.

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.