What is one of the primary functions of the lymphatic system?

The lymphatic system plays a crucial role in maintaining fluid balance within the body. One of its primary functions is returning interstitial fluid and leaked plasma proteins back to the bloodstream, which helps to prevent edema (swelling) and maintain normal blood volume. The interstitial fluid is the fluid that surrounds cells in the tissues, and it can accumulate if not properly drained.

As the lymphatic vessels transport this fluid, it is filtered through lymph nodes, which also play a key role in the immune response by filtering out pathogens and foreign substances. This process is essential for ensuring that tissues are adequately nourished, as well as for enabling the immune system to respond effectively to potential threats.

The other options do not accurately describe functions of the lymphatic system. Producing hormones pertains more to the endocrine system; digesting food is the function of the digestive system; and while the lymphatic system can contribute to immune responses related to infections that might affect temperature regulation, it does not primarily regulate body temperature.