Holocrine glands are a form of exocrine gland and secrete their substances through apoptosis. As the cell grows it enlarges and manufactures intracellular vesicles, that are filled with whatever the secretion may be. As the cell nears its death, it ruptures and the secretion is made available to the outside. Thus, because they require cell death, the upkeep of the gland requires resupply of tissues and high rate of mitosis. The tissue type is stratified cuboidal, which aids in secretion.