Cov hnab ntim khoom zoo li yog ib hom ntim ntim tau yooj yim uas muaj cov duab tshwj xeeb kom haum rau cov khoom sab hauv. Cov hnab no tuaj yeem ua tau ntau yam duab xws li cov hnab sawv ntsug, hnab hauv ncoo, hnab gusseted, thiab lwm yam. Cov duab ntawm lub hnab tuaj yeem hloov kho kom pom cov khoom thiab tso cai rau kev khaws cia thiab tuav tau yooj yim. Cov hnab ntim khoom zoo li feem ntau siv hauv kev lag luam zaub mov thiab dej haus, tab sis kuj tuaj yeem pom hauv cov tshuaj pleev ib ce, tshuaj, thiab cov khoom noj tsiaj. Lawv feem ntau yog tsim los ntawm cov ntaub ntawv xws li yas, ntawv, los yog ob qho tib si ua ke. Cov hnab no muaj cov dej noo zoo heev thiab cov pa oxygen, nrog rau kev sib tsoo thiab tsim kua muag, kom ntseeg tau tias cov khoom sab hauv tseem tshiab thiab tiv thaiv.
