Duct facts for kids

A duct is like a tiny tube inside your body. It helps carry important liquids from special body parts called exocrine glands or other organs. Think of it as a delivery pipe!

What are Ducts and How Do They Work?

In anatomy (the study of body parts) and physiology (the study of how body parts work), a duct is a small tube. These tubes lead from an exocrine gland or an organ. An exocrine gland is a gland that releases its products through a duct.

Ducts: Your Body's Delivery Pipes

Ducts are very important because they move liquids to where they are needed. For example, your tear ducts carry tears to your eyes. This keeps your eyes moist and clean. Other ducts carry things like sweat, saliva, or digestive juices.

What Ducts are Made Of

Ducts are lined with special cells called endothelial cells. These cells form a smooth inner surface. Outside this lining, there is a thin layer called the basement membrane. This layer helps support the duct.

Around the outside of many ducts, you'll find smooth muscle cells. These muscles are not like the ones you use to move your arms or legs. They work automatically, without you thinking about it. The smooth muscle cells gently squeeze the duct. This squeezing action helps push the liquid along the tube.