👉 Ductules are small, tube-like structures that make up the walls of a cell. These tubes are essential for gas exchange in the body because they allow gases to flow from one side of the cell to another. The cells also have specialized ductules called microvilli that help them maintain their shape and function within the cell. Ductules play an important role in maintaining homeostasis, as changes in gas exchange can affect other cellular functions such as metabolism and energy production.