Sistem organa za kretanje je ono što ti omogućava da... Show more
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Updated May 22, 2026
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Anatomija sistema pokreta
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Osnovni delovi sistema za kretanje
Tvoje telo je kao savršena mašina koju čine skelet (svih 206 kostiju zajedno) i mišići koji rade u tandemu. Kosti su tvoja unutrašnja potpora, dok mišići imaju supermoć da se skraćuju i opuštaju kako bi pokrenuli delove tela.
Zglobovi su ključna mesta gde se kosti spajaju i omogućavaju ti da se pokrećeš. Tetive povezuju mišiće sa kostima , dok ligamenti drže kosti zajedno u zglobovima .
Naš skelet ima tri glavna dela: skelet glave (lobanja koja štiti mozak), skelet trupa (kičmenica, rebra i grudna kost) i skelet udova (ruke i noge). Jedina pokretna kost na glavi je donja vilica - zato možeš da žvačeš!
💡 Zanimljivost: Butna kost je najduža kost u tvom telu, a kičmenica ima oblik dvostrukog slova S što joj daje elastičnost!
Građa kostiju i vrste zglobova
Svaka kost je zapravo živa struktura! Spolja je pokrivena pokosnicom, ispod koje je čvrsto koštano tkivo, a unutra se nalazi sunđerasto tkivo. Tu se krije koštana srž - fabrika koja pravi tvoje krvne ćelije.
Po obliku, kosti mogu biti duge (kao butna kost), kratke (u šaci i stopalu) ili pljosnate (kao kosti lobanje). Svaki oblik ima svoju posebnu funkciju.
Zglobovi su kao šarkovi na vratima, samo mnogo pametniji! Nepokretni zglobovi drže kosti srasle (kao na lobanji), polupokretni dozvoljavaju malo kretanja (između kičmenih pršljenova), a pokretni zglobovi ti omogućavaju velika kretanja poput savijanja ruke ili noge.
💡 Za test: Pokretni zglobovi imaju glatku hrskavicu i zglobnu tečnost koja ih podmazuje - kao ulje u mašini!
Kako mišići pokreću telo
Evo najkul dela - mišići nikad ne rade solo! Oni uvek rade u parovima koje zovemo antagonistički mišići. Dok se jedan grči, drugi se opušta, kao što biceps i triceps rade kada savijaš i opružaš ruku.
Imaš tri vrste mišićnog tkiva: poprečno-prugasti mišići koje svesno kontrolišeš (oni na rukama i nogama), glatki mišići koji rade automatski u organima, i srčani mišić koji pumpa tvoje srce bez tvoje dozvole.
Kada šutiraš loptu, mozak pošalje komandu preko nerava, mišići se grče, povlače tetive, a tetive pokreću kosti kroz zglobove. Čak i kada stoji mirno, tvoji mišići održavaju tonus - blago su zategnuti da te drže uspravno.
💡 Zapamti za test: Tetive = mišić + kost, Ligamenti = kost + kost. Ovo često pitaju!
Zdravlje i problemi sistema za kretanje
Za jake kosti trebaš kalcijum (pij mleko, jedi sir!) i vitamin D koji dobijaš od sunca. Redovna fizička aktivnost jača mišiće i čini ceo sistem otpornijim na povrede.
Pravilno držanje tela je super važno! Ako ne sediš i ne stojiš pravo, možeš dobiti skoliozu (krivljenje kičme u stranu), kifozu (pogrbljenost) ili lordozu (previše izvijenu kičmu).
Najčešće povrede su prelom (naprsnuće kosti), uganuće (istezanje ligamenata) i iščašenje (kada kost ispadne iz zglobnog ležišta). Srećom, tvoje telo je neverovatno u oporavku!
💡 Ključna razlika: Kosti su pasivni deo sistema (ne mogu same da se pokrenu), a mišići su aktivni deo (oni pokreću sve ostalo)!
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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
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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
Anatomija sistema pokreta
Sistem organa za kretanje je ono što ti omogućava da igraš fudbal, plesaš ili jednostavno hodaš do škole. Čine ga kosti koje daju telu oblik i čvrstinu, te mišići koji ih pokreću svojom snagom.
Osnovni delovi sistema za kretanje
Tvoje telo je kao savršena mašina koju čine skelet (svih 206 kostiju zajedno) i mišići koji rade u tandemu. Kosti su tvoja unutrašnja potpora, dok mišići imaju supermoć da se skraćuju i opuštaju kako bi pokrenuli delove tela.
Zglobovi su ključna mesta gde se kosti spajaju i omogućavaju ti da se pokrećeš. Tetive povezuju mišiće sa kostima , dok ligamenti drže kosti zajedno u zglobovima .
Naš skelet ima tri glavna dela: skelet glave (lobanja koja štiti mozak), skelet trupa (kičmenica, rebra i grudna kost) i skelet udova (ruke i noge). Jedina pokretna kost na glavi je donja vilica - zato možeš da žvačeš!
💡 Zanimljivost: Butna kost je najduža kost u tvom telu, a kičmenica ima oblik dvostrukog slova S što joj daje elastičnost!
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Građa kostiju i vrste zglobova
Svaka kost je zapravo živa struktura! Spolja je pokrivena pokosnicom, ispod koje je čvrsto koštano tkivo, a unutra se nalazi sunđerasto tkivo. Tu se krije koštana srž - fabrika koja pravi tvoje krvne ćelije.
Po obliku, kosti mogu biti duge (kao butna kost), kratke (u šaci i stopalu) ili pljosnate (kao kosti lobanje). Svaki oblik ima svoju posebnu funkciju.
Zglobovi su kao šarkovi na vratima, samo mnogo pametniji! Nepokretni zglobovi drže kosti srasle (kao na lobanji), polupokretni dozvoljavaju malo kretanja (između kičmenih pršljenova), a pokretni zglobovi ti omogućavaju velika kretanja poput savijanja ruke ili noge.
💡 Za test: Pokretni zglobovi imaju glatku hrskavicu i zglobnu tečnost koja ih podmazuje - kao ulje u mašini!
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Kako mišići pokreću telo
Evo najkul dela - mišići nikad ne rade solo! Oni uvek rade u parovima koje zovemo antagonistički mišići. Dok se jedan grči, drugi se opušta, kao što biceps i triceps rade kada savijaš i opružaš ruku.
Imaš tri vrste mišićnog tkiva: poprečno-prugasti mišići koje svesno kontrolišeš (oni na rukama i nogama), glatki mišići koji rade automatski u organima, i srčani mišić koji pumpa tvoje srce bez tvoje dozvole.
Kada šutiraš loptu, mozak pošalje komandu preko nerava, mišići se grče, povlače tetive, a tetive pokreću kosti kroz zglobove. Čak i kada stoji mirno, tvoji mišići održavaju tonus - blago su zategnuti da te drže uspravno.
💡 Zapamti za test: Tetive = mišić + kost, Ligamenti = kost + kost. Ovo često pitaju!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Zdravlje i problemi sistema za kretanje
Za jake kosti trebaš kalcijum (pij mleko, jedi sir!) i vitamin D koji dobijaš od sunca. Redovna fizička aktivnost jača mišiće i čini ceo sistem otpornijim na povrede.
Pravilno držanje tela je super važno! Ako ne sediš i ne stojiš pravo, možeš dobiti skoliozu (krivljenje kičme u stranu), kifozu (pogrbljenost) ili lordozu (previše izvijenu kičmu).
Najčešće povrede su prelom (naprsnuće kosti), uganuće (istezanje ligamenata) i iščašenje (kada kost ispadne iz zglobnog ležišta). Srećom, tvoje telo je neverovatno u oporavku!
💡 Ključna razlika: Kosti su pasivni deo sistema (ne mogu same da se pokrenu), a mišići su aktivni deo (oni pokreću sve ostalo)!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
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