MICROANATOMY

Detailed explanation-1: -Other types of differentiated cells, including blood cells, epithelial cells of the skin, and the epithelial cells lining the digestive tract, have short life spans and must be replaced by continual cell proliferation in adult animals.

Detailed explanation-2: -The Cells Involved in Tissue Repair The labile cells are under continuous active division and replace the cells that are lost from the body.

Detailed explanation-3: -The Dawn of Cellular Aging Research They showed that human cells in culture do not divide indefinitely but reach a limit (called the Hayflick limit) of replication and stop all further division. Cells approach this limit by slowing their divisions and entering cellular senescence, a dormant period.