Columnar epithelium consists of column-like cells with their nucleus towards the base. They line the stomach, small intestine, and colon, forming a mucous membrane. Their main functions are absorption (eg, stomach, intestine) and secretion (eg, mucosa by goblet cells). Stratified ...

(1) The Golgi apparatus consists of a system of membrane-bound vesicles arranged in stacks called cisternae. (2) The synthesized material is packaged near the ER and sent to various targets through the Golgi apparatus. (3) Its functions include storage, modification ...