A cikin matsakaicin matsakaicin namiji akwai kusan quarts 5 (lita 4.75) na jini, wanda ya ƙunshi kusan quarts 3 (lita 2.85) na plasma da quarts 2 (lita 1.9) na sel.
Kwayoyin jini suna rataye a cikin plasma, wanda ya ƙunshi ruwa da kayan da aka narkar da su, ciki har da hormones, antibodies, da enzymes da ake ɗauka zuwa kyallen takarda, da kuma kayan sharar salula da ake kaiwa huhu da kodan.
An rarraba manyan ƙwayoyin jini a matsayin sel ja (erythrocytes), farin sel (leukocytes), da platelets (thrombocytes).
Jajayen kwayoyin halitta ne masu laushi, zagaye, gawawwakin da ke dauke da haemoglobin, hadadden sinadaran da ke jigilar iskar oxygen da carbon dioxide.
Hemolysis yana faruwa ne lokacin da ɓacin rai na kariyar da ke rufe jajayen sel masu rauni ya fashe, yana barin haemoglobin ya tsere zuwa cikin plasma.Ana iya haifar da hemolysis ta hanyar muguwar sarrafa samfurin jini, barin yawon shakatawa da tsayi sosai (yana haifar da tsayawar jini) ko matse saman yatsa da ƙarfi yayin tarin capillary, dilution, fallasa ga gurɓatawa, matsanancin zafin jiki, ko yanayin cututtukan cututtuka.
