Hypertrophy is the increase of the size of an organ or in a select area of the tissue. It should be distinguished from hyperplasia which occurs due to cell division increasing the number of cells while their size stays the same; hypertrophy occurs due to an increase in the size of cells, while the number stays the same. Examples of hypertrophy Muscular hypertrophy One of the most common and visible forms of organ hypertrophy occurs in skeletal muscles in response to strength training (known as… (More on Hypertrophy)