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Updated Apr 19, 2026

7 pages

Celični transport: Aktivni in pasivni prenosi snovi

Celična membrana ni samo ovoj celice – je pametna bariera,... Show more

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# Celični transport

Uvod v celični transport

Celična membrana ni samo meja celice, ampak je selektivno prepustna
(semipermeabilna) bariera

Osnove celičnega transporta

Zakaj je celični transport sploh pomemben? Brez njega bi celice umrle v nekaj minutah – ne bi mogle dobivati hranil, izločati strupenih snovi ali komunicirati z okolico.

Selektivna prepustnost je ključna lastnost celične membrane. To pomeni, da dovoli prehod le določenim molekulam, drugim pa ne. Predstavljaj si jo kot izbirčnega vratarja kluba.

Koncentracijski gradient je razlika v koncentraciji snovi med dvema območjema. Snovi se naravno gibljejo "navzdol po pobočju" – od višje proti nižji koncentraciji. Ko pa jih hočeš potisniti "navzgor po pobočju", rabiš energijo.

💡 Pomni: Vse vrste transporta temeljijo na koncentracijskih gradientih – bodisi jih sledijo ali pa jih premagujejo z energijo.

# Celični transport

Uvod v celični transport

Celična membrana ni samo meja celice, ampak je selektivno prepustna
(semipermeabilna) bariera

Pasivni transport – brez porabe energije

Pasivni transport je kot spuščanje po toboganu – snovi se gibljejo same po sebi, brez da bi celica porabila ATP energijo.

Enostavna difuzija je najpreprosteji način. Majhne nepolarne molekule kot so kisik, ogljikov dioksid in steroidni hormoni enostavno "zdrsijo" skozi maščobni sloj membrane.

Pospešena difuzija potrebuje posebne transportne proteine za polarne ali nabite molekule. Kanalski proteini delujejo kot tuneli (npr. akvaporini za vodo), prenašalni proteini pa kot dvigala – vežejo molekulo, spremenijo obliko in jo sprostijo na drugi strani.

Osmoza je difuzija vode skozi selektivno prepustno membrano. Zapomni si preprosto: voda se giblje tja, kjer je "več soli".

💡 Hitri trik: V hipotonični raztopini celica nabrekne, v hipertonični skrči, v izotonični ostane enaka.

# Celični transport

Uvod v celični transport

Celična membrana ni samo meja celice, ampak je selektivno prepustna
(semipermeabilna) bariera

Osmoza v različnih celicah

Toničnost raztopine določa, kaj se zgodi s celico. Hipotonična raztopina ima manj soli kot celica, hipertonična več, izotonična enako.

Živalske celice v hipotonični raztopini nabreknejo in počijo (kot baloni), v hipertonični pa se skrčijo. Rastlinske celice so na boljšem – imajo trdno celično steno.

Ko rastlinska celica pride v hipotonično raztopino, postane turgidna (napeta) in se ne poči. V hipertonični raztopini pa se zgodi plazmoliza – celična membrana se loči od celične stene, ker voda izstopi iz vakuole.

Praktični primer: Zakaj solata ovene, ko jo posoliš? Ker je sol hipertonična raztopina, ki izvleče vodo iz rastlinskih celic!

💡 Za maturo: Plazmoliza je reverzibilen proces – če rastlino daš nazaj v vodo, se lahko opomore.

# Celični transport

Uvod v celični transport

Celična membrana ni samo meja celice, ampak je selektivno prepustna
(semipermeabilna) bariera

Aktivni transport – proti toku z energijo

Aktivni transport je kot vožnja navzgor po strmem klancu – rabiš motor (ATP), da premagaš gravitacijo (koncentracijski gradient).

Primarni aktivni transport porabi ATP neposredno. Zvezda je natrij-kalijeva črpalka, ki črpa 3 natrije ven in 2 kalije noter. Zakaj? Da vzdržuje električno napetost membrane, kar je ključno za delovanje mišic in živcev.

Proces deluje kot pametna revolving vrata: ATP se veže na črpalko, fosforilira jo, črpalka spremeni obliko, sprosti natrije ven, veže kalije, defosforilira se in sprosti kalije noter.

Sekundarni aktivni transport je pameten trik – porabi energijo ionskega gradienta, ki ga je ustvarila črpalka. Pri simportu se oba iona gibljeta v isto smer, pri antiportu v nasprotni.

💡 Analogija: Primarni transport je kot dvigovanje vode v rezervoar, sekundarni pa kot uporaba te vode za vrtenje turbine.

# Celični transport

Uvod v celični transport

Celična membrana ni samo meja celice, ampak je selektivno prepustna
(semipermeabilna) bariera

Transport velikih molekul z vezikli

Ko morajo celice prenašati velike molekule ali celo bakterije, uporabijo transport z vezikli – membrana se preoblikuje in tvori mehurčke.

Endocitoza je "zavarovanje" snovi v celico. Fagocitoza je "celično jedenje" velikih delcev (kot makrofagi, ki pojejo bakterije), pinocitoza je "celično pitje" tekočine.

Najbolj sofisticirana je receptorsko posredovana endocitoza. Snovi se najprej vežejo na specifične receptorje, nato se membrana upogne in naredi vezikel. Tako celice prevzamejo holesterol iz krvi.

Eksocitoza je obraten proces – celica izdelki vezikel v notranjosti, ga porine do membrane in sprosti vsebino navzven. Tako nevron sprošča nevrotransmiterje, trebušna slinavka pa prebavne encime.

💡 Pomni: Ves transport z vezikli potrebuje ATP za preoblikovanje membrane.

# Celični transport

Uvod v celični transport

Celična membrana ni samo meja celice, ampak je selektivno prepustna
(semipermeabilna) bariera

Praktični primeri v vsakdanjem življenju

Primer solate: Ko solatne liste posoliš, postanejo mehki. Zakaj? Sol ustvari hipertonično okolje, voda izteče iz rastlinskih celic, nastane plazmoliza in listi izgubijo turgor.

Delovanje živčnih celic: Natrij-kalijeva črpalka neprestano ustvarja električno napetost  70mV~-70 mV. Ko pride živčni impulz, se odprejo natrijski kanali, natrij vdre noter po gradientu in povzroči depolarizacijo. Brez predhodnega dela črpalke živčni sistem ne bi deloval!

Diabetiki in glukoza: Inzulin povzroči vstavitev GLUT4 prenašalcev v membrano mišičnih celic, kar omogoči pospešeno difuzijo glukoze iz krvi v celice.

Zakaj isotonične pijače? Športniki pijejo isotonične napitke, ker ne povzročijo osmotskega stresa v celicah – koncentracija je enaka kot v krvi.

💡 Mataturantski tip: Razlikuj med pospešeno difuzijo in aktivnim transportom – oba uporabljata proteine, a le aktivni porabi ATP!

# Celični transport

Uvod v celični transport

Celična membrana ni samo meja celice, ampak je selektivno prepustna
(semipermeabilna) bariera

Hitri povzetek za izpit

Pasivni transport (po gradientu, brez ATP): Enostavna difuzija za male nepolarne molekule, pospešena difuzija za polarne preko proteinov, osmoza za vodo.

Aktivni transport (proti gradientu, z ATP): Primarni porabi ATP neposredno Na+/K+cˇrpalkaNa+/K+ črpalka, sekundarni izkorišča ionske gradiente simport/antiportsimport/antiport.

Transport z vezikli (za velike molekule, z ATP): Endocitoza za vnos fago,pino,receptorskoposredovanafago-, pino-, receptorsko posredovana, eksocitoza za iznos.

Ključne razlike za maturo: Pospešena difuzija vs aktivni transport (ATP!), hipotonična vs hipertonična raztopina (smer vode), turgidnost vs plazmoliza (rastlinske celice).

💡 Zadnji nasvet: Vsi transportni proteini so specifični in se lahko zasitijo – to je pogosto ujeto na testih!



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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.

Samantha Klich

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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

 

Biologija

25

Updated Apr 19, 2026

7 pages

Celični transport: Aktivni in pasivni prenosi snovi

Celična membrana ni samo ovoj celice – je pametna bariera, ki odloča, kaj lahko vstopi v celico in kaj mora ven. Ta proces je življenjskega pomena za vse celice, saj omogoča pridobivanje hranil, izločanje odpadkov in ohranjanje ravnovesja.

# Celični transport

Uvod v celični transport

Celična membrana ni samo meja celice, ampak je selektivno prepustna
(semipermeabilna) bariera

Sign up to see the contentIt's free!

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Osnove celičnega transporta

Zakaj je celični transport sploh pomemben? Brez njega bi celice umrle v nekaj minutah – ne bi mogle dobivati hranil, izločati strupenih snovi ali komunicirati z okolico.

Selektivna prepustnost je ključna lastnost celične membrane. To pomeni, da dovoli prehod le določenim molekulam, drugim pa ne. Predstavljaj si jo kot izbirčnega vratarja kluba.

Koncentracijski gradient je razlika v koncentraciji snovi med dvema območjema. Snovi se naravno gibljejo "navzdol po pobočju" – od višje proti nižji koncentraciji. Ko pa jih hočeš potisniti "navzgor po pobočju", rabiš energijo.

💡 Pomni: Vse vrste transporta temeljijo na koncentracijskih gradientih – bodisi jih sledijo ali pa jih premagujejo z energijo.

# Celični transport

Uvod v celični transport

Celična membrana ni samo meja celice, ampak je selektivno prepustna
(semipermeabilna) bariera

Sign up to see the contentIt's free!

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Pasivni transport – brez porabe energije

Pasivni transport je kot spuščanje po toboganu – snovi se gibljejo same po sebi, brez da bi celica porabila ATP energijo.

Enostavna difuzija je najpreprosteji način. Majhne nepolarne molekule kot so kisik, ogljikov dioksid in steroidni hormoni enostavno "zdrsijo" skozi maščobni sloj membrane.

Pospešena difuzija potrebuje posebne transportne proteine za polarne ali nabite molekule. Kanalski proteini delujejo kot tuneli (npr. akvaporini za vodo), prenašalni proteini pa kot dvigala – vežejo molekulo, spremenijo obliko in jo sprostijo na drugi strani.

Osmoza je difuzija vode skozi selektivno prepustno membrano. Zapomni si preprosto: voda se giblje tja, kjer je "več soli".

💡 Hitri trik: V hipotonični raztopini celica nabrekne, v hipertonični skrči, v izotonični ostane enaka.

# Celični transport

Uvod v celični transport

Celična membrana ni samo meja celice, ampak je selektivno prepustna
(semipermeabilna) bariera

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Osmoza v različnih celicah

Toničnost raztopine določa, kaj se zgodi s celico. Hipotonična raztopina ima manj soli kot celica, hipertonična več, izotonična enako.

Živalske celice v hipotonični raztopini nabreknejo in počijo (kot baloni), v hipertonični pa se skrčijo. Rastlinske celice so na boljšem – imajo trdno celično steno.

Ko rastlinska celica pride v hipotonično raztopino, postane turgidna (napeta) in se ne poči. V hipertonični raztopini pa se zgodi plazmoliza – celična membrana se loči od celične stene, ker voda izstopi iz vakuole.

Praktični primer: Zakaj solata ovene, ko jo posoliš? Ker je sol hipertonična raztopina, ki izvleče vodo iz rastlinskih celic!

💡 Za maturo: Plazmoliza je reverzibilen proces – če rastlino daš nazaj v vodo, se lahko opomore.

# Celični transport

Uvod v celični transport

Celična membrana ni samo meja celice, ampak je selektivno prepustna
(semipermeabilna) bariera

Sign up to see the contentIt's free!

Access to all documents

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Aktivni transport – proti toku z energijo

Aktivni transport je kot vožnja navzgor po strmem klancu – rabiš motor (ATP), da premagaš gravitacijo (koncentracijski gradient).

Primarni aktivni transport porabi ATP neposredno. Zvezda je natrij-kalijeva črpalka, ki črpa 3 natrije ven in 2 kalije noter. Zakaj? Da vzdržuje električno napetost membrane, kar je ključno za delovanje mišic in živcev.

Proces deluje kot pametna revolving vrata: ATP se veže na črpalko, fosforilira jo, črpalka spremeni obliko, sprosti natrije ven, veže kalije, defosforilira se in sprosti kalije noter.

Sekundarni aktivni transport je pameten trik – porabi energijo ionskega gradienta, ki ga je ustvarila črpalka. Pri simportu se oba iona gibljeta v isto smer, pri antiportu v nasprotni.

💡 Analogija: Primarni transport je kot dvigovanje vode v rezervoar, sekundarni pa kot uporaba te vode za vrtenje turbine.

# Celični transport

Uvod v celični transport

Celična membrana ni samo meja celice, ampak je selektivno prepustna
(semipermeabilna) bariera

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

Transport velikih molekul z vezikli

Ko morajo celice prenašati velike molekule ali celo bakterije, uporabijo transport z vezikli – membrana se preoblikuje in tvori mehurčke.

Endocitoza je "zavarovanje" snovi v celico. Fagocitoza je "celično jedenje" velikih delcev (kot makrofagi, ki pojejo bakterije), pinocitoza je "celično pitje" tekočine.

Najbolj sofisticirana je receptorsko posredovana endocitoza. Snovi se najprej vežejo na specifične receptorje, nato se membrana upogne in naredi vezikel. Tako celice prevzamejo holesterol iz krvi.

Eksocitoza je obraten proces – celica izdelki vezikel v notranjosti, ga porine do membrane in sprosti vsebino navzven. Tako nevron sprošča nevrotransmiterje, trebušna slinavka pa prebavne encime.

💡 Pomni: Ves transport z vezikli potrebuje ATP za preoblikovanje membrane.

# Celični transport

Uvod v celični transport

Celična membrana ni samo meja celice, ampak je selektivno prepustna
(semipermeabilna) bariera

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

Praktični primeri v vsakdanjem življenju

Primer solate: Ko solatne liste posoliš, postanejo mehki. Zakaj? Sol ustvari hipertonično okolje, voda izteče iz rastlinskih celic, nastane plazmoliza in listi izgubijo turgor.

Delovanje živčnih celic: Natrij-kalijeva črpalka neprestano ustvarja električno napetost  70mV~-70 mV. Ko pride živčni impulz, se odprejo natrijski kanali, natrij vdre noter po gradientu in povzroči depolarizacijo. Brez predhodnega dela črpalke živčni sistem ne bi deloval!

Diabetiki in glukoza: Inzulin povzroči vstavitev GLUT4 prenašalcev v membrano mišičnih celic, kar omogoči pospešeno difuzijo glukoze iz krvi v celice.

Zakaj isotonične pijače? Športniki pijejo isotonične napitke, ker ne povzročijo osmotskega stresa v celicah – koncentracija je enaka kot v krvi.

💡 Mataturantski tip: Razlikuj med pospešeno difuzijo in aktivnim transportom – oba uporabljata proteine, a le aktivni porabi ATP!

# Celični transport

Uvod v celični transport

Celična membrana ni samo meja celice, ampak je selektivno prepustna
(semipermeabilna) bariera

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

Hitri povzetek za izpit

Pasivni transport (po gradientu, brez ATP): Enostavna difuzija za male nepolarne molekule, pospešena difuzija za polarne preko proteinov, osmoza za vodo.

Aktivni transport (proti gradientu, z ATP): Primarni porabi ATP neposredno Na+/K+cˇrpalkaNa+/K+ črpalka, sekundarni izkorišča ionske gradiente simport/antiportsimport/antiport.

Transport z vezikli (za velike molekule, z ATP): Endocitoza za vnos fago,pino,receptorskoposredovanafago-, pino-, receptorsko posredovana, eksocitoza za iznos.

Ključne razlike za maturo: Pospešena difuzija vs aktivni transport (ATP!), hipotonična vs hipertonična raztopina (smer vode), turgidnost vs plazmoliza (rastlinske celice).

💡 Zadnji nasvet: Vsi transportni proteini so specifični in se lahko zasitijo – to je pogosto ujeto na testih!

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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4.7/5

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