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.
To Galen: the fluid transported by the lymph vessels is lymph, which is returned to the cardiovascular system. The small organs associated with lymph vessels are lymph nodes. Hope this helps, good luck.fter passing through the lymph capillaries, the fluid is introduced into the afferent lymphatic vessels and then flows into the lymph nodes, which are small, round organs located throughout the body. The nodes filter waste from the fluid, while cells called lymphocytes kill any viruses or bacteria found within it.