Cov khoom tsis tsim

Lub ntsiab txhais ntawm cov khoom siv tsis yog khoom siv neeg-kev kho, neeg-cim, tsis yog lag luam circulating system cov khoom siv. Nws tau sib sau ua ke siv cov cuab yeej tsim tawm raws li kev sib koom ua ke cov qauv kev cai thiab cov kev cai uas tau muab los ntawm Lub Xeev, thiab tsim los ntawm kev xav tau ntawm cov neeg siv khoom. Raug cov khoom siv. Txawm hais tias tib hom neeg tus txheej txheem cov cai tsis zoo li qub, xws li cov cuab yeej tsis yog khoom siv tsis siv cov tshuab tapping.