Imibuzo Eyisibonelo Exoxa Nge-Lymphocytes Nezimpendulo Ezithile Zomzimba Wokuzivikela
Ku-biology kanye nezokwelapha, ukuqonda ukuthi isimiso somzimba sokuzivikela sisebenza kanjani kubalulekile ekuqondeni ukuthi imizimba yethu ilwa kanjani nezifo nezifo ezahlukahlukene. Ingxenye ebalulekile yalesi simiso ama-lymphocyte, amangqamuzana amhlophe egazi adlala indima ebalulekile empendulweni ethile yomzimba. Lesi sihloko sizoxoxa ngama-lymphocyte, indima yawo empendulweni ethile yomzimba, futhi sinikeze izibonelo zezinkinga zokujulisa ukuqonda kwethu ngalesi sihloko.
Isingeniso kuma-Lymphocyte kanye nempendulo ethize yomzimba
Ama-lymphocyte angamaseli amhlophe egazi abalulekile ekuphenduleni ezifweni. Afika ngezinhlobo ezimbili eziyinhloko: ama-B lymphocyte nama-T lymphocyte. Ama-B lymphocyte anesibopho sokukhiqiza ama-antibodies, amaprotheni ahlasela futhi aqede izifo ezibangelwa amagciwane njengebhaktheriya namagciwane. Okwamanje, ama-T lymphocyte asiza ukubulala amaseli athelelekile futhi alawule impendulo yomzimba.
Impendulo yokuzivikela komzimba ethize, noma eguquguqukayo, yingxenye yesimiso sokuzivikela somzimba esiqaphela futhi sikhumbule amagciwane athile ahlasela umzimba. Yingakho ukugoma kunganikeza isivikelo sesikhathi eside ezifweni ezithile.
Indlela Eqondile Yokuphendula Ngokuzivikela Emzimbeni
1. Ukuvuselelwa kwe-B Lymphocyte
– Uma umzimba uthola i-antigen yangaphandle, amaseli aveza i-antigen (ama-APC), njenge-macrophage, agwinya futhi acubungule i-antigen. Lezi zingcezu ze-antigen zibe sezivezwa ebusweni be-APC kanye nama-molecule e-MHC (Major Histocompatibility Complex).
– Ama-lymphocyte e-B anama-receptor athile e-antigen azoyibona futhi ayibophe, okubonisa ukuqala kokusebenza kwe-B lymphocyte.
– Uma sekusebenze, ama-B lymphocyte azohlukana abe amaseli e-plasma akhiqiza ama-antibodies namaseli enkumbulo ahlinzeka ngokuvikeleka kwesikhathi eside.
2. Ukusebenza kwe-T Lymphocyte
– Ama-T lymphocyte nawo asebenza ngokusebenzisana nama-APC, kodwa aqaphela ama-antigen alethwa ama-molecule e-MHC ahlukile kulawo aqashelwa ama-B lymphocyte.
– Ama-lymphocyte e-Helper T (CD4+) akhipha ama-cytokine asiza ekulawuleni nasekuthuthukiseni impendulo yomzimba, kuyilapho ama-lymphocyte e-cytotoxic T (CD8+) ebulala ngqo amaseli athelelekile.
Imibuzo Eyisibonelo Nengxoxo
umbuzo 1
Chaza indima yama-lymphocyte e-B kanye ne-T empendulweni ethile yomzimba.
Ingxoxo:
Ama-lymphocyte e-B kanye ne-T ayizinsika zempendulo ethile yomzimba. Ama-lymphocyte e-B, uma esesebenze yi-antigen ethile, ahlukana abe amaseli e-plasma angakhiqiza ama-antibodies ukuze ahlasele futhi aqede amagciwane. Aphinde akhe amaseli enkumbulo, asize ukuphendula ngokushesha uma kwenzeka ukutheleleka kabusha. Ama-lymphocyte e-T, ngakolunye uhlangothi, aqukethe izinhlobo eziningana:
– Ama-lymphocyte e-Helper T (CD4+), asiza ekuvuseleleni impendulo yomzimba ngokukhulula ama-cytokine.
– Ama-cytotoxic T lymphocytes (CD8+), abulala amangqamuzana omzimba atheleleke ngamagciwane.
– Kukhona nama-T lymphocyte alawulayo asiza ukulawula impendulo yomzimba ukuze ingabi ngokweqile.
umbuzo 2
Kwenzekani emzimbeni ngemva kokuchayeka ku-pathogen eqashelwe ngaphambilini ngenxa yempendulo ethile yomzimba?
Ingxoxo:
Uma umzimba uvezwa ku-pathogen eqashelwe ngaphambilini, amangqamuzana enkumbulo akhiwe ngesikhathi sokusabela kokuqala kokuzivikela komzimba enza umzimba ukwazi ukusabela ngokushesha nangendlela ephumelelayo. Amangqamuzana e-Memory B ahlukana ngokushesha abe amangqamuzana e-plasma futhi akhiqize inani elikhulu lama-antibodies. Okwamanje, amangqamuzana e-memory T angaqeda ngokushesha amangqamuzana athelelekile noma asize impendulo ye-B cell kanye ne-macrophage ngokukhiqiza ama-cytokine. Umphumela uba ukususwa okusheshayo kwe-pathogen kunangesikhathi sokuvezwa kokuqala.
umbuzo 3
Uma kukhulunywa ngokugoma, imijovo ingasiza kanjani ekwakhekeni kwempendulo ethile yomzimba yokuzivikela?
Ingxoxo:
Imijovo isebenza ngokuvuselela impendulo ethile yomzimba ngaphandle kokubangela izifo. Iqukethe ama-antigen avela kumagciwane abuthakathaka noma abulewe, noma izingxenye zamagciwane angabangela impendulo yomzimba. Lapho umuthi wokugoma ufakwa emzimbeni, ama-lymphocyte e-B kanye ne-T ayavuselelwa futhi acubungule ama-antigen ngendlela efanayo nokutheleleka kwemvelo. Amaseli enkumbulo abe esekhiwa, ahlinzeka ngokuvikeleka kwesikhathi eside ngokusheshisa impendulo yomzimba lapho igciwane langempela lihlasela esikhathini esizayo. Lesi yisisekelo sokuthi kungani ukugoma kungavimbela izifo.
Isiphetho
Ama-lymphocyte kanye nesistimu ethile yokuzivikela komzimba kuyisihluthulelo sokugcina impilo yomzimba nokuvikela ekuthelelekeni. Ngokusebenza kanye nokubambisana kwama-lymphocyte e-B kanye ne-T, umzimba ungakha impendulo esheshayo nehlelekile kumagciwane. Ukuzivocavoca kanye nengxoxo engenhla kulindeleke ukuthi kuqinise ukuqonda kwethu ukubaluleka kwama-lymphocyte ekuzivikeleni okuhambisanayo nokuthi imijovo ingasetshenziswa kanjani njengamathuluzi okuvikela asebenzayo. Ukuqonda lezi zindlela akubalulekile nje kuphela ngokwesayensi kodwa futhi kunikeza ukuqonda okusebenzayo emikhakheni yezempilo kanye nemithi.
