: Larger ducts, such as those in the breast or sweat glands, often feature stratified cuboidal or columnar epithelium to provide structural durability.
An is a tubular structure lined by epithelial cells that serves as a conduit for the transport of secretions (like sweat, saliva, or milk) or fluids (like urine) from glands or organs to their destination. 1. Structure and Tissue Type
The formation of epithelial ducts involves complex mechanical and genetic processes: epithelial duct
: Cells within the duct (e.g., in salivary glands) can actively modify the ion concentration or pH of the fluid they transport.
The cellular architecture of a duct is specialized based on its location and function: : Larger ducts, such as those in the
: To maintain a strict barrier—such as in renal collecting ducts —epithelial cells are joined by tight junctions to prevent the leakage of fluids into surrounding tissues. 2. Key Biological Functions
: Delivering enzymes (pancreas), hormones, or waste (kidneys). Structure and Tissue Type The formation of epithelial
: Most small and medium-sized ducts are lined by simple cuboidal epithelium , which is optimized for secretion and absorption.