2. simple cuboidal epithelium Description: Single layer of cubelike cells with large, spherical central nuclei Function: Function in secretion and absorption Locations:(1) In the secretory portions of many glands thyroid, mammary, and salivary (2)In the kidney tubules2. simple cuboidal epithelium Description: Single layer of cubelike cells with large, spherical central nuclei. Function: Function in secretion and absorption. Locations: (1) In the secretory portions of many glands : thyroid, mammary, and salivary. (2) In the kidney tubules