What is the primary function of lymphatic vessels?

The primary function of lymphatic vessels is to transport lymph fluid back to the circulatory system. The lymphatic system plays a critical role in maintaining fluid balance within the body by collecting excess tissue fluid, which is known as lymph, and returning it to the bloodstream. This process helps prevent edema, or swelling, that can occur when fluid accumulates in tissues.

Lymphatic vessels also carry immune cells and other substances, but their main role centers around the return of lymph fluid. The fluid transported by lymphatic vessels contains proteins, lipids, and waste products, which are filtered through lymph nodes. This filtering process helps to support the immune system by allowing immune cells to interact with pathogens or foreign substances.

While lymphatic vessels assist in immune functions and the removal of waste, their essential role is to maintain the body's fluid balance and support the transport of lymph back to the circulatory system.