Once excess fluid from the body tissue enters lymphatic capillaries, it is known as?

When excess fluid from body tissues enters the lymphatic capillaries, it is referred to as lymph. This fluid comprises proteins, waste products, and pathogens that the lymphatic system aims to filter and transport back to the bloodstream, thereby maintaining fluid balance in the body. The movement of interstitial fluid into the lymphatic capillaries is a critical process in the immune response, as it helps to transport immune cells and antibodies throughout the body.

Understanding lymph's role provides insight into its functions in both fluid regulation and immune function. Other terms like serum, plasma, and interstitial fluid refer to different components and states of fluid within the body; serum is the liquid part of blood after coagulation, plasma is the liquid component of blood containing water, electrolytes, and proteins but excludes cells, and interstitial fluid is the fluid surrounding tissue cells.