how is lymph formed?
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Lymph is the fluid that flows through vessels and nodes of the lymphatic system. It is formed when the interstitial fluid (the fluid which lies in the interstices of all body tissues) is collected through lymph capillaries. ... Lymph returns proteins and excess interstitial fluid to the bloodstream.
Lymphatic system is composed of lymph (or interstitial fluid), lymph vessels, lymph nodes or lymph glands, lymph organs (e.g., tonsils, adenoids, appendix, spleen, thymus gland, patches of tissue in the intes- tines called Peyer’s patches), and lymphoid tissue.
Monocytes and lymphocytes pass from the bloodstream through the blood capillary walls into the spaces between the cells in body tissue. When they pass into this lymph or interstitial fluid that surrounds cells, they perform their protective functions. Monocytes change into macrophages (MACK roh fay jehs), destroy pathogens, and collect debris from damaged cells. Lymphocytes are much more complicated and are essential to the immune response, so they are discussed in the next section. Once monocytes and lymphocytes pass into the lymphatic capillaries, the fluid is termed lymph or lymphatic fluid.