Sistimi ea polokelo ea thepa e ntlafalitsoeng ke k'hamphani ea rona e feto-fetoha habonolo ebile e ka tsamaellana habonolo le rasiti, lethathamo la thepa, polokelo le thomello ea thepa.Ka sistimi ea rona, o ka fumana boemo bo tsoelang pele ba thepa ka nako ea nnete, ho kenyelletsa le ho fihla ha thepa, boima ba 'mele, boholo ba lebokose, joalo-joalo, ka mor'a hore thepa eohle e lokisoe, o hloka feela ho tobetsa konopo ea ho tsamaisa, le basebetsi ba polokelong ba tla hlophisa lipalangoang tse tsoang kantle tsa thepa kapele kamoo ho ka khonehang.