What role does the lymphatic system play in the body?

The lymphatic system plays a crucial role in maintaining the body's homeostasis by contributing to immune function and fluid balance. It is responsible for transporting lymph, a fluid that contains infection-fighting white blood cells, throughout the body. This system helps in removing toxins, waste, and excess fluid from tissues, thereby preventing swelling and maintaining fluid balance.

Additionally, the lymphatic system is integral to the immune response. It houses lymph nodes, which filter lymph and trap pathogens, allowing the immune system to effectively identify and respond to infections. By coordinating the body's defense mechanisms, the lymphatic system helps protect against diseases and infections, making it a vital component of overall health.

Other options focus on functions that are not associated with the lymphatic system. For example, digestion is primarily the role of the gastrointestinal system, blood pressure regulation is mainly the function of the cardiovascular system, and red blood cell production occurs in the bone marrow. Thus, the choice highlighting the lymphatic system's involvement in immune function and fluid balance is the most accurate.