O Capillaries Secretory cells 3. Characteristics of endocrine glands A Ductless Cells are arranged in cord, follicle, aggregation or net-like structure, among them are spaces containing rich blood and lymph Caps.5 3. Characteristics of endocrine glands: A. Ductless. Cells are arranged in cord, follicle, aggregation or net-like structure, among them are spaces containing rich blood and lymph Caps