Tsarin kwarangwal yana nufin hanyar sadarwa na kasusuwa, guringuntsi, ligaments, da sauran nau'o'in haɗin gwiwar da ke tallafawa da siffar jiki, kare gabobin ciki, da kuma taimakawa motsi. Har ila yau, ya haɗa da ƙwayar kasusuwa da haɗin gwiwa, wanda ke sauƙaƙe motsi da kuma samar da sassauci. Tsarin kwarangwal yana da mahimmanci don kiyaye tsari da amincin jiki, kuma yana taka muhimmiyar rawa a cikin matakai daban-daban na ilimin halittar jiki kamar samar da kwayoyin jini, ajiyar ma'adinai, da tsarin hormone.