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.
lymph is a colourless watery substance similar to blood plasma. it contains cells called Lymphocytes. lymph transparts dead cells, bacteria and toxins to the lymph nodes where â¦ all the bacteria, dead cells and toxins are filtered from the lymph then the lymph returns to the blood stream once filtered =].herefore lymph, the fluid in lymph vessels, is basically a fluid of roughly the same composition as blood plasma. Lymph nodes are famous for their role in the Immune System. Structures called Lymph Nodes which produce cells called Lyphocytes. These have many and various function in the immune system.