What are the primary functions of lymph?

The primary functions of lymph include returning proteins and transporting foreign particles to lymph nodes. Lymph is a clear fluid that circulates through the lymphatic system, which plays a critical role in immune function and the maintenance of fluid balance in the body.

One key aspect of lymph is its role in returning proteins, particularly large ones that cannot easily enter the blood capillaries, back into the bloodstream. This is essential for maintaining proper osmotic pressure and overall fluid balance. Additionally, lymph acts as a transport medium for foreign particles, including pathogens and debris, which are brought to lymph nodes. This process is vital for immune surveillance as lymph nodes contain lymphocytes and other immune cells that can respond to and eliminate these foreign invaders.

Comparatively, the other choices do not accurately reflect the primary functions of lymph. While glucose, hormones, and electrolytes are transported in bodily fluids, they are typically associated with blood circulation rather than the lymphatic system's primary roles. Filtering blood and removing waste is primarily performed by the kidneys rather than by lymph, which again emphasizes lymph's unique role in protein return and participation in immune defense.