What is the relationship between tissue fluid and lymph?
Tissue fluid and lymph are both a part of the extracellular fluid of multicellular organisms.
Tissue fluid is defined as interstitial fluid that surrounds cells of tissues within the organisms. Tissue fluid bathes the cells with nutrients such as sugars, amino acids, fatty acids, and hormones. Tissue fluid may also contain waste products from cells. However, tissue fluid contains white blood cells that help to combat infection within the body.
Lymph is a type of tissue fluid that has entered into a lymphatic capillary. One of the functions of lymph is to pick up proteins that have leaked out of the blood capillaries, as well as extra interstitial fluid. Lymph then returns the proteins and excess intestinal fluid to the bloodstream. Lymph also picks up bacteria. Lymph brings the bacteria to lymph nodes. The lymph nodes then help to destroy the bacteria.