What is Pathology - What role do cellular adaptations play in the body?

What is Pathology - What role do cellular adaptations play in the body?
​Changes in cells and tissues occur as a result of sustained stimulation, a shortage of oxygen and nutrients, or chronic injury, and are referred to as adaptation. Adaptations are normally reversible, although they can become irreversible in some instances. They include reversible processes like atrophy, hypertrophy, hyperplasia, and metaplasia, as well as intracellular accumulation of various chemicals.