What is the primary role of the lymphatic system?

The primary role of the lymphatic system is to support immune function. This is achieved through several key mechanisms. The lymphatic system is responsible for transporting lymph, a fluid that contains infection-fighting white blood cells (lymphocytes), throughout the body. Lymph nodes, distributed throughout the lymphatic network, act as filters for foreign particles and pathogens, allowing the immune system to monitor and respond to threats such as infections or cancerous cells.

Additionally, the lymphatic system helps to maintain fluid balance in the body by returning excess interstitial fluid back to the bloodstream, which is crucial for overall homeostasis. The interaction between lymph fluid and immune cells enhances the body’s ability to respond to pathogens, making the lymphatic system integral to the functioning of the immune system. Thus, the correct answer emphasizes its supportive role in immune function as opposed to other systems in the body that are responsible for tasks like oxygen transport, digestion, or hormonal circulation.