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Updated Mar 26, 2026
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Celični organeli in njihove ključne funkcije
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Uvod v celične organele
Zakaj se sploh ukvarjamo s celičnimi organeli? Ker so osnova življenja! Celični organeli so specializirane strukture, ki jih najdemo v evkariontskih celicah - torej v celicah rastlin, živali, gliv in protistov.
Evkariontske celice imajo pravo jedro z jedrno ovojnico in organele, obdane z membranami. Mi ljudje smo evkarionti. Prokariontske celice (kot so bakterije) pa so precej preprostejše - nimajo pravega jedra in njihova DNK prosto plava v citoplazmi.
💡 Pomni: Citoplazma je vsa vsebina celice, razen jedra. Tu se "dogajajo stvari"!
Organeli so torej kot majhni oddelki v celični tovarni. Vsak ima svojo membrano (kot svojo pisarno) in svojo specifično funkcijo, ki je ključna za preživetje celice.
Jedro in mitohondrij
Jedro je "šef" celice - največji organel z dvojno membrano in porami. V njem je shranjena DNK, ki vsebuje vsa navodila za delovanje celice. V jedrcu nastajajo ribosomi. Brez jedra bi bila celica kot tovarna brez načrtov.
Mitohondrij je celična elektrarna! Ima dve membrani - zunanja je gladka, notranja pa je nagubana v kriste. Te gube povečajo površino za kemijske reakcije.
Tu poteka celično dihanje, kjer se iz glukoze in kisika sprošča energija in nastaja ATP - glavna "energetska valuta" celice. Vsak proces v celici potrebuje ATP za pogon.
💡 Zanimivost: Mitohondriji imajo lastno DNK in se razmnožujejo samostojno - verjetno so bili nekoč samostojne bakterije!
Kloroplasti in ribosomi
Kloroplasti so samo v rastlinskih celicah in algah - oni so tisti, zaradi katerih so rastline zelene! Imajo dvojno membrano, v notranjosti pa tilakoide, zložene v grane.
Tu poteka fotosinteza: s pomočjo sončne svetlobe, vode in CO₂ nastajata glukoza (hrana) in kisik. Formula: 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂. Torej rastline si same "kuhajo" hrano!
Ribosomi so majhni, a izjemno pomembni! Nimajo membrane, lahko pa so prosti v citoplazmi ali vezani na ER. So kot delavci, ki berejo navodila iz jedra in iz njih sestavljajo beljakovine - proces imenovan sinteza beljakovin.
💡 Pomni: Kloroplasti = tovarna hrane, ribosomi = tovarna beljakovin!
Endoplazemski retikulum in Golgijev aparat
Endoplazemski retikulum (ER) je kot transportni sistem celice - mreža membran, ki povezuje jedro z drugimi deli celice.
Zrnati ER ima na površini ribosome in obdeluje beljakovine, ki so namenjene "izvozu" iz celice. Gladki ER pa nima ribosomov - tu nastajajo maščobe, poteka razstrupljanje in se shranjujejo kalcijevi ioni.
Golgijev aparat je celična pošta! Sestavljen je iz sploščenih vrečk (cistern). Sprejme snovi iz ER, jih dodatno obdela, sortira in zapakira v vezikule - majhne transportne "pakete".
💡 Predstavljaj si: ER je kot tovarna, Golgijev aparat pa kot pošta, ki pošlje izdelke na pravo mesto!
Ti vezikuli potem potujejo po celici ali se zlijejo s celično membrano in izločijo vsebino iz celice.
Lizosomi in primerjava celic
Lizosomi so "smetarski servis" celice - majhni mehurčki s prebavnimi encimi. Razgrajujejo poškodovane organele, bakterije in druge odvečne snovi. Njihova notranjost je kisla, kar potrebujejo encimi za delovanje.
Glavne razlike med rastlinsko in živalsko celico so tri: celična stena , kloroplasti in osrednja vakuola .
Oba tipa celic imata jedro, mitohondrije, ribosome, ER in Golgijev aparat. Tudi rastline "dihajo" z mitohondriji - fotosinteza in celično dihanje sta različna procesa!
💡 Za test: Rastlinska celica = živalska celica + celična stena + kloroplasti + velika vakuola
Lizosomi so pogosti v živalskih celicah, v rastlinskih pa to funkcijo večinoma prevzame osrednja vakuola.
Sodelovanje organelov
Organeli ne delajo posamično - sodelujejo kot usklajena ekipa! Poglejmo primer izdelave in izločitve encima iz celice:
Jedro pošlje navodilo (mRNK) → ribosom na zrnatem ER sestavi beljakovino → zrnati ER jo obdela → Golgijev aparat jo zapakira v vezikel → vezikel potuje do celične membrane in izloči encim.
Za teste si zapomni ključne funkcije: jedro (navodila), mitohondrij (energija), ribosom (beljakovine), ER (transport), Golgijev aparat (pakiranje), lizosom (razgradnja).
Endosimbiontska teorija razlaga, kako so nastali mitohondriji in kloroplasti - verjetno so bili nekoč samostojne bakterije, ki jih je "požrla" večja celica, potem pa so ostali v simbiozi.
💡 Hiter povzetek: Jedro = knjižnica, mitohondrij = elektrarna, ribosom = delavec, ER = transportni sistem, Golgijev = pošta, lizosom = recikliranje!
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This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
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Anna
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Best app on earth! no words because it’s too good
Thomas R
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Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
Celični organeli in njihove ključne funkcije
Celični organeli so kot specializirani "organi" znotraj vsake celice, kjer vsak opravlja svojo posebno nalogo. Predstavljaj si jih kot različne oddelke v veliki tovarni, kjer vsi sodelujejo, da celica lahko živi in deluje. Razumevanje njihovih funkcij ti bo pomagalo razumeti,... Show more
Uvod v celične organele
Zakaj se sploh ukvarjamo s celičnimi organeli? Ker so osnova življenja! Celični organeli so specializirane strukture, ki jih najdemo v evkariontskih celicah - torej v celicah rastlin, živali, gliv in protistov.
Evkariontske celice imajo pravo jedro z jedrno ovojnico in organele, obdane z membranami. Mi ljudje smo evkarionti. Prokariontske celice (kot so bakterije) pa so precej preprostejše - nimajo pravega jedra in njihova DNK prosto plava v citoplazmi.
💡 Pomni: Citoplazma je vsa vsebina celice, razen jedra. Tu se "dogajajo stvari"!
Organeli so torej kot majhni oddelki v celični tovarni. Vsak ima svojo membrano (kot svojo pisarno) in svojo specifično funkcijo, ki je ključna za preživetje celice.
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Jedro in mitohondrij
Jedro je "šef" celice - največji organel z dvojno membrano in porami. V njem je shranjena DNK, ki vsebuje vsa navodila za delovanje celice. V jedrcu nastajajo ribosomi. Brez jedra bi bila celica kot tovarna brez načrtov.
Mitohondrij je celična elektrarna! Ima dve membrani - zunanja je gladka, notranja pa je nagubana v kriste. Te gube povečajo površino za kemijske reakcije.
Tu poteka celično dihanje, kjer se iz glukoze in kisika sprošča energija in nastaja ATP - glavna "energetska valuta" celice. Vsak proces v celici potrebuje ATP za pogon.
💡 Zanimivost: Mitohondriji imajo lastno DNK in se razmnožujejo samostojno - verjetno so bili nekoč samostojne bakterije!
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Kloroplasti in ribosomi
Kloroplasti so samo v rastlinskih celicah in algah - oni so tisti, zaradi katerih so rastline zelene! Imajo dvojno membrano, v notranjosti pa tilakoide, zložene v grane.
Tu poteka fotosinteza: s pomočjo sončne svetlobe, vode in CO₂ nastajata glukoza (hrana) in kisik. Formula: 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂. Torej rastline si same "kuhajo" hrano!
Ribosomi so majhni, a izjemno pomembni! Nimajo membrane, lahko pa so prosti v citoplazmi ali vezani na ER. So kot delavci, ki berejo navodila iz jedra in iz njih sestavljajo beljakovine - proces imenovan sinteza beljakovin.
💡 Pomni: Kloroplasti = tovarna hrane, ribosomi = tovarna beljakovin!
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Endoplazemski retikulum in Golgijev aparat
Endoplazemski retikulum (ER) je kot transportni sistem celice - mreža membran, ki povezuje jedro z drugimi deli celice.
Zrnati ER ima na površini ribosome in obdeluje beljakovine, ki so namenjene "izvozu" iz celice. Gladki ER pa nima ribosomov - tu nastajajo maščobe, poteka razstrupljanje in se shranjujejo kalcijevi ioni.
Golgijev aparat je celična pošta! Sestavljen je iz sploščenih vrečk (cistern). Sprejme snovi iz ER, jih dodatno obdela, sortira in zapakira v vezikule - majhne transportne "pakete".
💡 Predstavljaj si: ER je kot tovarna, Golgijev aparat pa kot pošta, ki pošlje izdelke na pravo mesto!
Ti vezikuli potem potujejo po celici ali se zlijejo s celično membrano in izločijo vsebino iz celice.
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Lizosomi in primerjava celic
Lizosomi so "smetarski servis" celice - majhni mehurčki s prebavnimi encimi. Razgrajujejo poškodovane organele, bakterije in druge odvečne snovi. Njihova notranjost je kisla, kar potrebujejo encimi za delovanje.
Glavne razlike med rastlinsko in živalsko celico so tri: celična stena , kloroplasti in osrednja vakuola .
Oba tipa celic imata jedro, mitohondrije, ribosome, ER in Golgijev aparat. Tudi rastline "dihajo" z mitohondriji - fotosinteza in celično dihanje sta različna procesa!
💡 Za test: Rastlinska celica = živalska celica + celična stena + kloroplasti + velika vakuola
Lizosomi so pogosti v živalskih celicah, v rastlinskih pa to funkcijo večinoma prevzame osrednja vakuola.
Sign up to see the contentIt's free!
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Join milions of students
Sodelovanje organelov
Organeli ne delajo posamično - sodelujejo kot usklajena ekipa! Poglejmo primer izdelave in izločitve encima iz celice:
Jedro pošlje navodilo (mRNK) → ribosom na zrnatem ER sestavi beljakovino → zrnati ER jo obdela → Golgijev aparat jo zapakira v vezikel → vezikel potuje do celične membrane in izloči encim.
Za teste si zapomni ključne funkcije: jedro (navodila), mitohondrij (energija), ribosom (beljakovine), ER (transport), Golgijev aparat (pakiranje), lizosom (razgradnja).
Endosimbiontska teorija razlaga, kako so nastali mitohondriji in kloroplasti - verjetno so bili nekoč samostojne bakterije, ki jih je "požrla" večja celica, potem pa so ostali v simbiozi.
💡 Hiter povzetek: Jedro = knjižnica, mitohondrij = elektrarna, ribosom = delavec, ER = transportni sistem, Golgijev = pošta, lizosom = recikliranje!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
Where can I download the Knowunity app?
You can download the app from Google Play Store and Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user