What is the primary function of the lymphatic system?

The primary function of the lymphatic system is to maintain fluid balance and support immune response. The lymphatic system collects excess fluid from tissues and transports it back into the bloodstream, preventing edema and ensuring that fluid levels remain balanced in the body. Additionally, it plays a crucial role in immune function by transporting lymph, which contains white blood cells that help defend the body against pathogens. The lymph nodes serve as filtration points, trapping harmful substances and facilitating the immune response.

While the other options touch on important bodily functions, they do not accurately encompass the main roles of the lymphatic system. The transportation of nutrients is typically associated with the circulatory system. Filtration of waste is primarily the function of the kidneys and excretory system rather than the lymphatic system. Hormonal regulation is managed by the endocrine system, which is distinct from the roles of the lymphatic system.