The matrix of connective tissue may be jelly-like, fluid, dense, or rigid, depending on the specific function of the tissue.

Connective tissue cells are loosely spaced and embedded in an intercellular matrix.

Glandular epithelium forms when a portion of the epithelial tissue folds inward, resulting in the formation of multicellular glands capable of secreting substances.

Epithelial cells can undergo specialization to become gland cells, which secrete substances at the epithelial surface.

Cuboidal epithelium provides mechanical support in structures such as kidney tubules and salivary gland ducts.