1540s, belonging to an ecclesiastical metropolis, from Late Latin metropolitanus, from Greek metropolites resident of a city, from metropolis (see metropolitan (n.)). Meaning belonging to a chief or capital city is from 1550s. In reference to underground city railways, it is attested from 1867.
The solution that runs through these vessels, called lymph, begins in the circulatory system as blood plasma and then is converted to a fluid known as an interstitial or intercellular fluid. This fluid is responsible for delivering hormones, oxygen, and various nutrients to cells throughout the body.fferent vessels transport fluid into the lymph nodes, while efferent vessels carry filtered lymph away from the lymph nodes. White blood cells called lymphocytes are a major part of the lymphatic system. Lymph nodes may become swollen when a person gets sick.
Describe the process of lymph formation (i.e., how/why fluid enters the lymphatic capillaries). When fluid pressure in interstitial space is greater than pressure in lymphatic capillary minivalve flaps open, fluid enters lymphatic capillary. When fluid pressure is greater in lymphatic capillary, minivalves close, preventing lymph from leaking back out as pressure moves it along the vessel. (lymph starts as interstitial fluid) How does the lymphatic system contribute to fluid balance in the body?