Txawm li cas los xij, thaum cov carcinogens qhia hauv lub cev lawv tuaj yeem cuam tshuam cov noob thiab ua rau lawv hloov pauv mus rau qhov tsis zoo. Cov kev hloov pauv no tshwm sim thaum DNA ua ib daim qauv ntawm nws tus kheej ua ntej mitosis. Yog li ntawd, cov cell tshiab uas tau muab luam tawm kuj muaj kev hloov pauv hauv nws cov DNA. Mob qog noj ntshav tau yug los.
Qhov cuam tshuam ntawm carcinogen yog dab tsi?
A carcinogen yog tus neeg sawv cev uas muaj peev xwm ua rau mob qog noj ntshav hauv tib neeg. Carcinogens tej zaum yuav yog ntuj, xws li aflatoxin, uas yog tsim los ntawm ib tug fungus thiab tej zaum kuj pom nyob rau hauv khaws cia nplej, los yog manmade, xws li asbestos los yog haus luam yeeb. Carcinogens ua haujlwm los ntawm kev cuam tshuam nrog lub cell DNA thiab inducing genetic mutations.
Puas mob qog noj ntshav qeeb zuj zus?
Cov duab ntawm cov qog nqaij hlav cancer qhia tias cov qog nqaij hlav tsis muaj peev xwm tsis txhob faib thaum lawv tiv nrog cov hlwb zoo sib xws. Cov qog nqaij hlav cancer tsis muaj cov kev kuaj xyuas ib txwm muaj thiab sib npaug hauv qhov chaw uas tswj thiab txwv kev faib cell. Cov txheej txheem ntawm kev faib cell, txawm li cas los xij lossis cov qog nqaij hlav cancer, yog dhau ntawm lub voj voog ntawm tes.
Yuav ua li cas yog carcinogen nws cuam tshuam mitosis li cas?
mob qog noj ntshav yog tshwm sim los ntawm cov hlwb hauv lub cev uas faib nrawm dhau los ntawm mitosis. Ib lub xovtooj ntawm tes tuaj yeem hloov mus rau hauv cov kabmob kheesxaws yog tias nws raug rau cov kabmob carcinogen. Cov kab mob carcinogen yog ib yam tshuaj uas tuaj yeem ua rau mob qog noj ntshav, los ntawm kev hloov DNA hauv cell.
Kev sib raug zoo ntawm lub voj voog ntawm tes thiab mob qog noj ntshav yog dab tsi?
Superficially, kev sib txuas ntawm lub voj voog ntawm tes thiab mob qog noj ntshav yog qhov pom tseeb: lub voj voog tshuab hluav taws xob tswj cov cell proliferation, thiab mob qog noj ntshav yog ib yam kab mob ntawm kev loj hlob ntawm tes tsis tsim nyog. Hauv paus, tag nrho cov qog nqaij hlav tso cai rau muaj ntau lub hlwb.
