What are the key differences between fibrosis and sclerosis in terms of their impact on the body's tissues?

Fibrosis is the formation of excess fibrous connective tissue in response to injury or inflammation, leading to scarring and stiffness in the affected area. Sclerosis, on the other hand, refers to the hardening or thickening of tissues, often due to the accumulation of substances like calcium. Both conditions can impair the normal function of tissues and organs, but fibrosis is more focused on the formation of scar tissue, while sclerosis involves the hardening of tissues.