Vretenčarji so največja skupina živali, ki jih srečujemo povsod okoli... Show more
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Updated Apr 10, 2026
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Osnove Vretenčarjev: Ribe, Dvoživke, Plazilci, Ptiči in Sesalci
1 / 5
Uvod v vretenčarje
Vsak dan vidiš neskončno živali - od psa, ki ga sprehajaš, do ribic v akvariju. Vse te živali imajo nekaj skupnega: hrbtenico iz vretenc, ki jim daje oporo in ščiti hrbtni mozeg.
Vretenčarje delimo v pet glavnih skupin: ribe, dvoživke, plazilce, ptiče in sesalce. Vsaka skupina se je prilagodila življenju v svojem okolju na popolnoma drugačen način.
Ena najpomembnejših razlik med njimi je telesna temperatura. Ribe, dvoživke in plazilci imajo spremenljivo temperaturo - pozimi so počasnejši ali celo hibernirajo. Ptiči in sesalci pa ohranjajo stalno temperaturo, zato so aktivni tudi v mrazu, vendar morajo za to pojesti veliko hrane.
💡 Zapomni si: Hrbtenica ni samo "ogrodje" - je zaščita za hrbtni mozeg, brez katerega ne bi mogli živeti!
Ribe in dvoživke
Ribe so mojstri podvodnega življenja. Njihove luske in sluz jim pomagajo gladko plavati, škrge pa jim omogočajo dihanje pod vodo. Samica odloži ikre v vodo, samec pa jih oplodi - to je zunanja oploditev.
Dvoživke so prave pustolovke - del življenja preživijo v vodi, del pa na kopnem. Imajo golo, vlažno kožo, skozi katero lahko celo dihajo! Njihov življenjski ciklus je fascinanten: iz mrest (jajčec) v vodi se razvije paglavec s škrgami, ki se nato preobrazi v odraslo žival s pljuči.
Najbolj znana slovenska dvoživka je človeška ribica - naš edini endemit, ki živi samo v kraških jamah. Posebna je, ker celo življenje ohrani škrge in živi v vodi.
💡 Hitri test: Če žival odloži jajčeca v vodo in ima vlažno kožo, je to dvoživka!
Plazilci in ptiči
Plazilci so se popolnoma osamosvojili od vode. Njihova suha koža z roženimi luskami jih ščiti pred izsušitvijo, zato lahko živijo tudi v puščavi. Jajca z usnjato lupino odlagajo na kopnem - to je bila revolucionarna prilagoditev!
Ptiči so gospodje neba. Perje jim omogoča letenje in ohranja toploto, kljun nadomešča zobe, votle kosti pa zmanjšajo težo. Njihova pljuča so povezana z zračnimi vrečami, kar jih dela izjemno učinkovite pri dihanju.
Ptiči so tudi odlični starši - valjejo jajca in skrbijo za mladiče. Za razliko od plazilcev imajo stalno telesno temperaturo, kar jim omogoča življenje tudi v Antarktiki (pinguini!).
💡 Zanimivost: Ptičje kosti so votle kot slamice - to jih naredi lahke za letenje!
Sesalci in primeri razlikovanja
Sesalci so najrazvitejši vretenčarji. Dlaka jih ogreva, mlečne žleze omogočajo hranjenje mladičev z mlekom, večina pa koti žive mladiče. Živijo povsod - od netopirjev v zraku do kitov v oceanih.
Zakaj kit ni riba? Čeprav živi v vodi, diha s pljuči (mora priti na površje), doji mladiče z mlekom in ima stalno telesno temperaturo. To so značilnosti sesalcev!
Kako razlikuješ žabo od martinčka? Žaba ima golo, vlažno kožo in se razvije iz paglavca (preobrazba). Martinček ima suho kožo z luskami, iz jajca pa se izvali že popolnoma razvit.
💡 Ključna razlika: Dvoživke morajo v vodo za razmnoževanje, plazilci pa ne!
Povzetek za teste
Zapomni si pet skupin vretenčarjev in njihove ključne značilnosti:
- Ribe: škrge, luske, ikre v vodi, spremenljiva temperatura
- Dvoživke: vlažna koža, preobrazba (paglavec), mrest v vodi
- Plazilci: rožene luske, jajca na kopnem, suha koža
- Ptiči: perje, peruti, stalna temperatura, skrb za mladiče
- Sesalci: dlaka, mlečne žleze, živi mladiči, stalna temperatura
Pri testih pazi na temperature telesa: samo ptiči in sesalci imajo stalno. Ne zamešaj iker (ribe) z mrestom (dvoživke). Človeška ribica je naš endemit - živi samo v Sloveniji.
💡 Za test: Naredi si tabelo s primeri za vsako skupino - tako boš hitreje prepoznal, kam sodi vsaka žival!
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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.
Most popular content in Biologija
Most popular content
Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
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
Osnove Vretenčarjev: Ribe, Dvoživke, Plazilci, Ptiči in Sesalci
Vretenčarji so največja skupina živali, ki jih srečujemo povsod okoli sebe - od rib v morju do ptičev v zraku. Vsi imajo eno stvar skupno: hrbtenico, ki jim daje oporo in ščiti hrbtni mozeg.
Uvod v vretenčarje
Vsak dan vidiš neskončno živali - od psa, ki ga sprehajaš, do ribic v akvariju. Vse te živali imajo nekaj skupnega: hrbtenico iz vretenc, ki jim daje oporo in ščiti hrbtni mozeg.
Vretenčarje delimo v pet glavnih skupin: ribe, dvoživke, plazilce, ptiče in sesalce. Vsaka skupina se je prilagodila življenju v svojem okolju na popolnoma drugačen način.
Ena najpomembnejših razlik med njimi je telesna temperatura. Ribe, dvoživke in plazilci imajo spremenljivo temperaturo - pozimi so počasnejši ali celo hibernirajo. Ptiči in sesalci pa ohranjajo stalno temperaturo, zato so aktivni tudi v mrazu, vendar morajo za to pojesti veliko hrane.
💡 Zapomni si: Hrbtenica ni samo "ogrodje" - je zaščita za hrbtni mozeg, brez katerega ne bi mogli živeti!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Ribe in dvoživke
Ribe so mojstri podvodnega življenja. Njihove luske in sluz jim pomagajo gladko plavati, škrge pa jim omogočajo dihanje pod vodo. Samica odloži ikre v vodo, samec pa jih oplodi - to je zunanja oploditev.
Dvoživke so prave pustolovke - del življenja preživijo v vodi, del pa na kopnem. Imajo golo, vlažno kožo, skozi katero lahko celo dihajo! Njihov življenjski ciklus je fascinanten: iz mrest (jajčec) v vodi se razvije paglavec s škrgami, ki se nato preobrazi v odraslo žival s pljuči.
Najbolj znana slovenska dvoživka je človeška ribica - naš edini endemit, ki živi samo v kraških jamah. Posebna je, ker celo življenje ohrani škrge in živi v vodi.
💡 Hitri test: Če žival odloži jajčeca v vodo in ima vlažno kožo, je to dvoživka!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Plazilci in ptiči
Plazilci so se popolnoma osamosvojili od vode. Njihova suha koža z roženimi luskami jih ščiti pred izsušitvijo, zato lahko živijo tudi v puščavi. Jajca z usnjato lupino odlagajo na kopnem - to je bila revolucionarna prilagoditev!
Ptiči so gospodje neba. Perje jim omogoča letenje in ohranja toploto, kljun nadomešča zobe, votle kosti pa zmanjšajo težo. Njihova pljuča so povezana z zračnimi vrečami, kar jih dela izjemno učinkovite pri dihanju.
Ptiči so tudi odlični starši - valjejo jajca in skrbijo za mladiče. Za razliko od plazilcev imajo stalno telesno temperaturo, kar jim omogoča življenje tudi v Antarktiki (pinguini!).
💡 Zanimivost: Ptičje kosti so votle kot slamice - to jih naredi lahke za letenje!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Sesalci in primeri razlikovanja
Sesalci so najrazvitejši vretenčarji. Dlaka jih ogreva, mlečne žleze omogočajo hranjenje mladičev z mlekom, večina pa koti žive mladiče. Živijo povsod - od netopirjev v zraku do kitov v oceanih.
Zakaj kit ni riba? Čeprav živi v vodi, diha s pljuči (mora priti na površje), doji mladiče z mlekom in ima stalno telesno temperaturo. To so značilnosti sesalcev!
Kako razlikuješ žabo od martinčka? Žaba ima golo, vlažno kožo in se razvije iz paglavca (preobrazba). Martinček ima suho kožo z luskami, iz jajca pa se izvali že popolnoma razvit.
💡 Ključna razlika: Dvoživke morajo v vodo za razmnoževanje, plazilci pa ne!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Povzetek za teste
Zapomni si pet skupin vretenčarjev in njihove ključne značilnosti:
- Ribe: škrge, luske, ikre v vodi, spremenljiva temperatura
- Dvoživke: vlažna koža, preobrazba (paglavec), mrest v vodi
- Plazilci: rožene luske, jajca na kopnem, suha koža
- Ptiči: perje, peruti, stalna temperatura, skrb za mladiče
- Sesalci: dlaka, mlečne žleze, živi mladiči, stalna temperatura
Pri testih pazi na temperature telesa: samo ptiči in sesalci imajo stalno. Ne zamešaj iker (ribe) z mrestom (dvoživke). Človeška ribica je naš endemit - živi samo v Sloveniji.
💡 Za test: Naredi si tabelo s primeri za vsako skupino - tako boš hitreje prepoznal, kam sodi vsaka žival!
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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Most popular content in Biologija
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Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
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