Krvni obtokje kot izjemno dovršen transportni sistem v tvojem... Show more
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Updated Mar 18, 2026
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Krvni obtok - Spoznaj kako naše telo deluje
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Uvod v krvni obtok
Tvoje telo deluje kot popolna tovarna, kjer krvni obtok poskrbi, da vsaka celica dobi točno to, kar potrebuje. Srce deluje kot mogočna črpalka, krvne žile so kot avtoceste različnih velikosti, kri pa je kot tovornjaki, naloženi z vsem potrebnim.
Ta sistem ima tri glavne komponente: srce (cor) kot centralno črpalko, krvne žile kot transportno mrežo in kri (sanguis) kot transportno sredstvo. Brez njega bi celice enostavno umrle, ker ne bi dobile kisika ali hrane.
Arterije vodijo kri stran od srca, vene jo vračajo nazaj, kapilare pa so kot majhne trgovine, kjer celice kupujejo kisik in oddajajo odpadke. Preprosto, kajne?
💡 Zapomni si: Arterije = stran Od srca, Vene = V srce (tako si lahko pomagaš s črkami!)
Srce - tvoja življenjska črpalka
Predstavljaj si srce kot hišo s štirimi sobami, ki nenehno črpa kri po telesu. Desna stran (desni preddvor in prekat) se ukvarja s "slabo" krvjo, polno ogljikovega dioksida, leva stran pa s "čisto" krvjo, napolnjeno s kisikom.
Levi prekat je najšibkejši del, ker mora kri potisniti po celem telesu - to je kot razlika med pošiljanjem paketa v sosednjo hišo ali na drugi konec države. Med sobami so zaklopke, ki delujejo kot enosmerni ventili.
Tvoje srce se stisne približno 100.000-krat na dan, ne da bi se kdaj ustavilo za počitek. Pri telesni aktivnosti se pospeši, ker mišice kličejo: "Potrebujemo več kisika!"
💡 Zanimivost: Levi prekat ima najdebelejšo steno - mora biti močan, da potisne kri vse do prstov na nogah!
Krvne žile in kri
Arterije so kot avtoceste z debelimi, prožnimi stenami, ki prenesejo visok tlak krvi. Vene so bolj kot lokalne ceste z zaklopkami, ki preprečijo, da bi kri tekla nazaj. Kapilare so kot ozke uličice, kjer se dogaja vsa akcija.
Kri ni le rdeča tekočina - je kot pametna dostava. Krvna plazma (55% krvi) je kot tovornjak, rdeče krvničke so kot kurirji za kisik, bele krvničke kot varnostniki, krvne ploščice pa kot hitri mechaniki za popravila.
Hemoglobin v rdečih krvničkah je kot posebne torbe, ki držijo kisik. Ko se napolnijo s kisikom, je kri svetlo rdeča, ko ga oddajo, pa temno rdeča.
💡 Pomembno: Arterije NE nosijo vedno oksigenirane krvi - pljučna arterija nosi "slabo" kri!
Mali in veliki krvni obtok
Mali krvni obtok je kot hitra pot do čistilnice. Kri iz desne strani srca gre v pljuča, kjer odda ogljikov dioksid in pobere sveži kisik. Nato se po pljučnih venah vrne v levo stran srca - pripravljena za novo pustolovščino.
Veliki krvni obtok je glavna tura po celem telesu. Levi prekat močno izstreli kri v aorto (največjo arterijo), od tam pa se razcepi na tisoče manjših cest, ki vodijo do vseh organov, mišic in celic.
V kapilarah se zgodi čudež - kri odda kisik in hranila, pobere pa ogljikov dioksid in odpadke. Potem se po venah lepo počasi vrača nazaj v desno stran srca.
💡 Predstavljaj si: Mali obtok = kratka pot do trgovine, veliki obtok = dolgo potovanje okoli sveta!
Praktični primeri delovanja
Če greš iz razreda v telovadnico, tvoja rdeča krvnička opravi neverjetno pot: iz pljuč v levo stran srca, nato po aorto navzdol do mišic v nogah, kjer odda kisik za tek. Potem se odpravlja nazaj proti srcu z "odpadki" iz mišic.
Ko se urežeš, krvne ploščice takoj prihitijo na pomoč kot gasilci. Sprožijo kemijsko reakcijo, ki ustvari mrežo niti in ujame rdeče krvničke - nastane krasta, ki zamaši rano.
Krvni tlak 120/80 pomeni, da je pritisk krvi 120, ko se srce stisne, in 80, ko počiva. Tvoj srčni utrip se med vadbo pospeši, ker celice kličejo: "Hitro, potrebujemo več goriva!"
💡 Praktičen nasvet: Če hočeš zdravo srce, se gibaj - kot vsaka črpalka potrebuje redno uporabo!
Hiter povzetek za teste
Osnovne funkcije: Transport kisika in hranil v celice, odvoz odpadkov iz celic. Sistem deluje 24/7 brez premora.
Ključne komponente: Srce s 4 votlinami (desna stran za "slabo" kri, leva za "čisto"), arterije (od srca), vene (v srce), kapilare (izmenjava snovi).
Dva obtoka: Mali (srce → pljuča → srce za oksigenacijo), veliki (srce → telo → srce za oskrbo celic). Vsaka krvnička opravi oba obtoka v približno minuti.
Pomembne napake pri testih: Ne pozabi, da pljučna arterija vodi "slabo" kri od srca, pljučna vena pa "čisto" kri v srce. Levi prekat je najmočnejši, ker pokriva največ ozemlja.
💡 Za odličen test: Nariši si shemo obtokov in sledi poti ene krvničke - to ti bo pomagalo pri vseh vprašanjih!
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.
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
Krvni obtok - Spoznaj kako naše telo deluje
Krvni obtok je kot izjemno dovršen transportni sistem v tvojem telesu - mreža cest, po katerih nenehno potujejo tovornjaki z življenjsko pomembnim tovorom. Razumevanje tega sistema ti bo pomagalo ugotoviti, kako tvoje telo skrbi za vsako posamezno celico.
Uvod v krvni obtok
Tvoje telo deluje kot popolna tovarna, kjer krvni obtok poskrbi, da vsaka celica dobi točno to, kar potrebuje. Srce deluje kot mogočna črpalka, krvne žile so kot avtoceste različnih velikosti, kri pa je kot tovornjaki, naloženi z vsem potrebnim.
Ta sistem ima tri glavne komponente: srce (cor) kot centralno črpalko, krvne žile kot transportno mrežo in kri (sanguis) kot transportno sredstvo. Brez njega bi celice enostavno umrle, ker ne bi dobile kisika ali hrane.
Arterije vodijo kri stran od srca, vene jo vračajo nazaj, kapilare pa so kot majhne trgovine, kjer celice kupujejo kisik in oddajajo odpadke. Preprosto, kajne?
💡 Zapomni si: Arterije = stran Od srca, Vene = V srce (tako si lahko pomagaš s črkami!)
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Srce - tvoja življenjska črpalka
Predstavljaj si srce kot hišo s štirimi sobami, ki nenehno črpa kri po telesu. Desna stran (desni preddvor in prekat) se ukvarja s "slabo" krvjo, polno ogljikovega dioksida, leva stran pa s "čisto" krvjo, napolnjeno s kisikom.
Levi prekat je najšibkejši del, ker mora kri potisniti po celem telesu - to je kot razlika med pošiljanjem paketa v sosednjo hišo ali na drugi konec države. Med sobami so zaklopke, ki delujejo kot enosmerni ventili.
Tvoje srce se stisne približno 100.000-krat na dan, ne da bi se kdaj ustavilo za počitek. Pri telesni aktivnosti se pospeši, ker mišice kličejo: "Potrebujemo več kisika!"
💡 Zanimivost: Levi prekat ima najdebelejšo steno - mora biti močan, da potisne kri vse do prstov na nogah!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
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Krvne žile in kri
Arterije so kot avtoceste z debelimi, prožnimi stenami, ki prenesejo visok tlak krvi. Vene so bolj kot lokalne ceste z zaklopkami, ki preprečijo, da bi kri tekla nazaj. Kapilare so kot ozke uličice, kjer se dogaja vsa akcija.
Kri ni le rdeča tekočina - je kot pametna dostava. Krvna plazma (55% krvi) je kot tovornjak, rdeče krvničke so kot kurirji za kisik, bele krvničke kot varnostniki, krvne ploščice pa kot hitri mechaniki za popravila.
Hemoglobin v rdečih krvničkah je kot posebne torbe, ki držijo kisik. Ko se napolnijo s kisikom, je kri svetlo rdeča, ko ga oddajo, pa temno rdeča.
💡 Pomembno: Arterije NE nosijo vedno oksigenirane krvi - pljučna arterija nosi "slabo" kri!
Sign up to see the contentIt's free!
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Improve your grades
Join milions of students
Mali in veliki krvni obtok
Mali krvni obtok je kot hitra pot do čistilnice. Kri iz desne strani srca gre v pljuča, kjer odda ogljikov dioksid in pobere sveži kisik. Nato se po pljučnih venah vrne v levo stran srca - pripravljena za novo pustolovščino.
Veliki krvni obtok je glavna tura po celem telesu. Levi prekat močno izstreli kri v aorto (največjo arterijo), od tam pa se razcepi na tisoče manjših cest, ki vodijo do vseh organov, mišic in celic.
V kapilarah se zgodi čudež - kri odda kisik in hranila, pobere pa ogljikov dioksid in odpadke. Potem se po venah lepo počasi vrača nazaj v desno stran srca.
💡 Predstavljaj si: Mali obtok = kratka pot do trgovine, veliki obtok = dolgo potovanje okoli sveta!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Praktični primeri delovanja
Če greš iz razreda v telovadnico, tvoja rdeča krvnička opravi neverjetno pot: iz pljuč v levo stran srca, nato po aorto navzdol do mišic v nogah, kjer odda kisik za tek. Potem se odpravlja nazaj proti srcu z "odpadki" iz mišic.
Ko se urežeš, krvne ploščice takoj prihitijo na pomoč kot gasilci. Sprožijo kemijsko reakcijo, ki ustvari mrežo niti in ujame rdeče krvničke - nastane krasta, ki zamaši rano.
Krvni tlak 120/80 pomeni, da je pritisk krvi 120, ko se srce stisne, in 80, ko počiva. Tvoj srčni utrip se med vadbo pospeši, ker celice kličejo: "Hitro, potrebujemo več goriva!"
💡 Praktičen nasvet: Če hočeš zdravo srce, se gibaj - kot vsaka črpalka potrebuje redno uporabo!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Hiter povzetek za teste
Osnovne funkcije: Transport kisika in hranil v celice, odvoz odpadkov iz celic. Sistem deluje 24/7 brez premora.
Ključne komponente: Srce s 4 votlinami (desna stran za "slabo" kri, leva za "čisto"), arterije (od srca), vene (v srce), kapilare (izmenjava snovi).
Dva obtoka: Mali (srce → pljuča → srce za oksigenacijo), veliki (srce → telo → srce za oskrbo celic). Vsaka krvnička opravi oba obtoka v približno minuti.
Pomembne napake pri testih: Ne pozabi, da pljučna arterija vodi "slabo" kri od srca, pljučna vena pa "čisto" kri v srce. Levi prekat je najmočnejši, ker pokriva največ ozemlja.
💡 Za odličen test: Nariši si shemo obtokov in sledi poti ene krvničke - to ti bo pomagalo pri vseh vprašanjih!
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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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