Tsarin da Aikin Kwayoyin Jini na Ja
Kwayoyin jinin ja, ko erythrocytes, suna ɗaya daga cikin manyan sassan jini a cikin tsarin zagayawar jini na mutane da sauran halittu masu ƙashi. Waɗannan ƙwayoyin suna taka muhimmiyar rawa wajen jigilar iskar oxygen daga huhu zuwa dukkan kyallen jiki da kuma ɗaukar carbon dioxide, wani abu da ke haifar da metabolism, daga kyallen jiki zuwa huhu don fitar da su. Fahimtar tsari da aikin ƙwayoyin jinin ja yana da mahimmanci don fahimtar yadda jini ke cika muhimmiyar rawar da yake takawa a cikin ilimin halittar jiki. Wannan labarin zai yi nazari kan tsari da aikin ƙwayoyin jinin ja a zurfi, gami da yadda waɗannan ƙwayoyin suka daidaita don cika muhimmiyar rawar da suke takawa.
Tsarin Kwayar Jini ta Ja
1. Siffa da Girma
Kwayoyin jinin jajaye suna da siffar biconcave, ko kuma siffar faifan diski, masu siffar concave a ɓangarorin biyu. Wannan siffar ba ta da wani dalili; tana ba wa waɗannan ƙwayoyin babban rabo na yanki-zuwa-girma, wanda ke ba da damar yaɗuwar iskar gas mai inganci, musamman iskar oxygen da carbon dioxide. Matsakaicin ƙwayar jinin ja yana da diamita na kimanin micrometers 6-8 (µm) da kuma 2 µm a gefunansa masu kauri, yayin da tsakiyar ta fi siriri, kimanin µm 1.
2. Yawan sinadarin haemoglobin
Mafi mahimmancin sinadarin ƙwayoyin jinin ja shine haemoglobin, wani furotin mai ɗauke da ƙarfe wanda ke iya ɗaure iskar oxygen da carbon dioxide. Hemoglobin ya ƙunshi ƙananan sassa guda huɗu, kowannensu yana da ƙwayar heme mai ɗauke da ion na ƙarfe. Wannan yana ba da damar ƙwayar haemoglobin ɗaya ta ɗaure har zuwa ƙwayoyin oxygen guda huɗu. ja mai jini an samo shi daga haemoglobin mai iskar oxygen.
3. Tantanin halitta
Famfon jan jini tsari ne mai sassauƙa wanda ke ba shi damar ratsa ƙananan ƙwayoyin jini waɗanda diamitansu ya fi ƙanƙanta fiye da ƙwayar kanta. An yi wannan famfon ne da lipids da sunadarai, wanda ke ba da damar yin laushi da kwanciyar hankali na injiniya da ake buƙata don tsira daga wucewar jini akai-akai.
4. Rashin Nucleus da Organelles
Ba kamar sauran ƙwayoyin halitta a jiki ba, ƙwayoyin jinin ja da suka manyanta ba su da ƙwayar halitta ko wasu ƙwayoyin halitta kamar mitochondria. da kuma endoplasmic reticulumRashin sinadarin Nucleus yana faruwa ne a lokacin matakin ƙarshe na bambancin ƙwayoyin jinin ja. Rashin wannan organelle yana ba da damar ƙarin sarari ga haemoglobin kuma yana ƙara ƙarfin ƙwayar jinin ja wajen jigilar iskar oxygen. Duk da haka, yana kuma nufin cewa ƙwayar jinin ja ba za ta iya gyara kanta ko kuma ta shiga rarrabuwar ƙwayoyin halitta ba, wanda ke haifar da ɗan gajeren lokaci na kimanin kwanaki 120.
Aikin Kwayoyin Jini Masu Jan Jini
1. Sufurin Iskar Oxygen
Babban aikin ƙwayoyin jinin ja shine jigilar iskar oxygen daga huhu zuwa kyallen jiki. Wannan tsari yana farawa da iskar oxygen da ke shiga huhu, inda yake bazuwa cikin ƙwayoyin jinin da ke cikin alveoli. Hemoglobin da ke cikin ƙwayoyin jinin ja yana ɗaure iskar oxygen, yana samar da oxyhemoglobin. Sannan ƙwayoyin jinin ja masu iskar oxygen suna tafiya ta cikin zagayawar jini kuma suna fitar da iskar oxygen zuwa ƙwayoyin jikin jiki inda matsin iskar oxygen ya yi ƙasa.
2. Jigilar Carbon Dioxide
Kwayoyin jinin ja suna aiki wajen jigilar carbon dioxide daga kyallen jiki zuwa huhu. Carbon dioxide shine ƙarshen samfurin metabolism na ƙwayoyin halitta kuma dole ne a fitar da shi daga jiki. Yawancin carbon dioxide ana jigilar shi a cikin jini a matsayin bicarbonate (HCO3-), amma ƙaramin adadin kuma ana jigilar shi a cikin plasma ko kuma a ɗaure shi zuwa hemoglobin a matsayin carboxyhemoglobin.
3. Tsarin pH na jini
Kwayoyin jinin ja suna taka rawa wajen kiyaye daidaiton acid-base a cikin jini. Ta hanyar jigilar carbon dioxide, suna taimakawa wajen daidaita pH na jini. Ta hanyar enzyme carbonic anhydrase da ake samu a cikin ƙwayoyin jinin ja, iskar carbon dioxide tana amsawa da ruwa don samar da carbonic acid (H2CO3), wanda daga nan zai rikide ya zama hydrogen ions (H+) da bicarbonate (HCO3-). Wannan tsari yana da mahimmanci wajen kiyaye daidaiton acid-base na jiki da kuma hana manyan canje-canje a pH na jini.
4. Sufurin Nitric Oxide (NO)
Binciken da aka yi kwanan nan ya nuna cewa ƙwayoyin jinin ja suna iya jigilar nitric oxide, wani babban ƙwayar cuta a cikin daidaita hawan jini da kuma daidaita shi Guduwar jini a cikin kyallen takarda daban-daban. Ana samar da NO ta hanyar jijiyoyin jini endothelium kuma ana iya jigilar shi zuwa gare shi. ta hanyar haemoglobin a sake shi inda ake buƙata, yana taimakawa wajen jijiyar jini da kuma ƙara yawan kwararar jini zuwa takamaiman sassan jiki.
Zagayen Rayuwa na Kwayoyin Jini na Ja
Ana samar da jajayen ƙwayoyin jini a cikin bargon ƙashi ta hanyar wani tsari da aka sani da erythropoiesis. Erythropoiesis yana farawa da ƙwayoyin halittar jini, waɗanda ke bambanta zuwa proerythroblasts, waɗanda daga nan suka girma ta matakai daban-daban zuwa manyan erythrocytes. Hormone erythropoietin (EPO), wanda kodan ke samarwa, yana ƙarfafa samar da ƙwayoyin jinin ja, musamman lokacin da jiki ke fuskantar hypoxia (rashin isashshen iskar oxygen).
Bayan kimanin kwanaki 120 a cikin zagayawar jini, tsoffin ƙwayoyin jinin ja suna ɗaukewa kuma suna lalata su ta hanyar ƙwayoyin cuta a cikin spleen, hanta, da kuma ƙashi. Haemoglobin da ya ragu kaɗan yana wargazawa zuwa heme da globin. Ana sake amfani da ƙarfen da ke cikin heme don samar da sabbin ƙwayoyin jinin ja, yayin da sauran sassan heme ɗin ke canzawa zuwa bilirubin kuma suna fita daga cikin bile.
Cututtuka da Cututtukan Kwayoyin Jini na Ja
Yanayi da dama na iya shafar jajayen ƙwayoyin jini da ayyukansu, kamar rashin jini, wanda ke da alaƙa da raguwar adadin haemoglobin ko jajayen ƙwayoyin jini, wanda ke haifar da raguwar ƙarfin ɗaukar iskar oxygen a jini. Ana iya haifar da rashin jini ta hanyoyi daban-daban, ciki har da rashin ƙarfe, rashin bitamin B12 ko folic acid, da cututtuka masu tsanani kamar cututtukan koda.
Cutar Sickle cell (ciwon sickle cell anemia) wata cuta ce ta kwayoyin halitta wadda ƙwayoyin jinin ja suke da siffar da ba ta dace ba kuma suna da rauni, wanda ke haifar da toshewar kwararar jini da lalacewar kyallen jiki. Thalassemia wata cuta ce ta kwayoyin halitta da ke shafar samar da haemoglobin kuma tana haifar da rashin jini na dogon lokaci.
Kammalawa
Kwayoyin jinin ja muhimmin bangare ne na tsarin zagayawar jini, musamman jigilar iskar oxygen da carbon dioxide da kuma taimakawa wajen kula da daidaiton pH na jini. Tsarinsu na musamman, tare da siffar biconcave, haemoglobin mai arzikin ƙarfe, da rashin nucleus da organelles, yana ba su damar yin waɗannan muhimman ayyuka yadda ya kamata. Tashin hankali a cikin samar da ƙwayoyin jinin ja ko aiki na iya haifar da cututtuka iri-iri waɗanda ke buƙatar kulawar likita ta musamman. Fahimtar yadda ƙwayoyin jinin ja ke aiki da kuma yadda ake sarrafa su na iya taimakawa wajen gano da kuma magance matsalolin da suka shafi jini.
