<prompt> What is hyperplasia?Decrease in cell sizeIncrease in cell sizeIncrease in cell numberDecrease in cell number  <response>: Physiological adaptive responses include: Hyperophy - increase in cell size Hyperplasia - increase in number of cells Atrophy - decrease in cell size and number Metaplasia - reversible replacement of one cell type by another differentiated cell type Hyperplasia is common in cells capable of replication namely labile cells stable cells or stem cells Reference robbins page no 2. 