I loko o ka awelika kāne kāne makua, aia ma kahi o 5 mau kuata (4.75 lita) o ke koko, i haku ʻia ma kahi o 3 kuata (2.85 lita) o ka plasma a me 2 kuata (1.9 lita) o nā cell.
Hoʻokuʻu ʻia nā keʻena koko i loko o ka plasma, kahi i hana ʻia me ka wai a me nā mea i hoʻoheheʻe ʻia, me nā hormones, antibodies, a me nā enzyme e lawe ʻia ana i nā ʻiʻo, a me nā huahana ʻōpala e lawe ʻia ana i nā māmā a me nā puʻupaʻa.
Hoʻokaʻawale ʻia nā keʻena koko nui ma ke ʻano he ʻulaʻula (erythrocytes), nā keʻokeʻo (leukocytes), a me nā platelets (thrombocytes).
ʻO nā ʻulaʻula he mau kino palupalu, poepoe, concave i loaʻa ka hemoglobin, ka mea paʻakikī e lawe i ka oxygen a me ke kalapona kalapona.
Hana ʻia ka hemolysis i ka wā i haki ʻia ai ka membrane pale lahilahi e hoʻopaʻa ana i nā ʻulaʻula palupalu, e ʻae ana i ka hemo ʻana o ka hemoglobin i loko o ka plasma.Hiki ke hana ʻia ka hemolysis ma muli o ka lawelawe ʻana i ke koko, waiho ʻia ka tourniquet i ka lōʻihi loa (no ka hoʻopaʻa ʻana i ke koko) a i ʻole ke ʻomi ʻana i ka piko o ka manamana lima i ka wā o ka hōʻiliʻili capillary, ka hoʻoheheʻe ʻana, ka ʻike ʻana i nā mea haumia, ke kiʻekiʻe o ka wela, a i ʻole nā kūlana pathologic.
