What is one key function of the lymphatic system?

The lymphatic system plays a crucial role in maintaining the body’s fluid balance and immune system function. One of its key functions is helping remove waste products and toxins from the body. The lymphatic system collects excess interstitial fluid, which contains cellular waste, and returns it to the bloodstream. Additionally, as lymph fluid passes through lymph nodes, it is filtered of harmful substances, such as bacteria and other pathogens, which are then cleared by immune cells. This function is vital for preventing infections and maintaining overall health.

This highlights the importance of the lymphatic system in detoxification and immune support, while the other options focus on different physiological roles that are managed by other systems—such as temperature regulation by the integumentary system, hormone production primarily by the endocrine system, and oxygen transport being a key function of the circulatory system.