Size of a normal pig kidney (left) compared to a solitary pig kidney (right).<unk> is a type of regenerative<unk>  that can take place in a number of human organs after the organs are either damaged, removed, or cease to function. Additionally, increased functional demand can also stimulate this<unk>  in tissues and organs. The<unk>  can be a result of increased cell size<unk>  hypertrophy) or an increase in cell division<unk>  hyperplasia) or both. For instance, if one kidney is surgically removed, the cells of other kidney divide at an increased rate. Eventually, the remaining kidney can grow until its mass approaches the combined mass of two kidneys. Along with the kidneys,<unk> has also been characterized in a number of other tissues and organs including: * the adrenal glands * the heart * muscles * the liver * the lungs * the pancreas (beta cells and acinar cells) * the mammary gland * the spleen (where bone marrow and lymphatic tissue undergo<unk>  hypertrophy and assumes the spleen function during spleen injury) * the testicles * the thyroid gland * The turbinates A large number of<unk>  factors and hormones are involved with<unk>  but the exact mechanism is not fully understood and probably varies between different organs. Nevertheless, angiogenic<unk>  factors which control the<unk>  of blood vessels are particularly important because blood flow significantly determines the maximum<unk>  of an organ.<unk> may also refer to the accelerated<unk>  following a period of slowed<unk> , particularly as a result of nutrient deprivation.
Compensatory growth 
Reproductive compensation
Anoikis
Epithelial–mesenchymal transition
Gender transitioning
Starvation response
Clonal hematopoiesis
Autoregulation