Obehová sústava je tvoj životne dôležitý transportný systém - predstav... Show more
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Updated Mar 25, 2026
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Obehová sústava: Prenos látok v tele a starostlivosť o srdce
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Prehľad obehovej sústavy
Tvoja obehová sústava je ako perfektne zorganizovaná doručovacia služba. Jej hlavnou úlohou je transport kyslíka, živín a hormónov do všetkých buniek, plus odvoz odpadu ako oxid uhličitý.
Systém sa skladá z troch kľúčových častí: srdca (motor celého systému), ciev (cesty pre krv) a krvi (tekuté tkanivo s mnohými funkciami). Rozlišujeme dva hlavné typy obehu - malý krvný obeh do pľúc na okysličenie krvi a veľký krvný obeh do celého tela.
Krvný tlak je sila, ktorou krv tlačí na steny ciev, a pulz ti ukazuje, koľkokrát za minútu tvoje srdce bije. Tieto hodnoty sú dôležité indikátory tvojho zdravia.
💡 Tip: Tvoje srdce je asi také veľké ako tvoja zaťatá päsť a bije približne 100 000-krát denne!
Srdce - náš motor
Tvoje srdce je dutý svalový orgán rozdelený na štyri dutiny. Dve predsiene prijímajú krv a dve komory ju vypudzujú ven. Medzi nimi sú chlopne, ktoré zabezpečujú tok krvi len jedným smerom.
Srdcový cyklus má dva hlavné kroky. Počas diastoly sa srdce uvoľní a naplní krvou. Pri systole sa srdce stiahne a vypudí krv do ciev - najprv sa stiahnu predsiene, potom komory.
Ľavá komora má najhrubšiu stenu, pretože musí pumpovať krv do celého tela pod vysokým tlakom. Pravá strana srdca pracuje s nižším tlakom, keďže posiela krv len do pľúc.
💡 Zaujímavosť: Tvoje srdce nepotrebuje signály z mozgu na bitie - má vlastný "vodič tempa" v srdcovom svale!
Cievy - krvné diaľnice
Máš tri hlavné typy ciev s rôznymi funkciami. Tepny vedú krv zo srdca a majú hrubé, pružné steny, aby vydržali vysoký tlak. Väčšinou prenášajú okysličenú krv, výnimkou je pľúcna tepna.
Žily vedú krv do srdca a majú tenšie steny ako tepny. Obsahujú chlopne, hlavne v končatinách, ktoré bránia spätnému toku kvôli gravitácii. Väčšinou prenášajú odkysličenú krv, okrem pľúcnych žíl.
Vlásočnice sú najtenšie cievy s jedinečnou funkciou. Ich stena je len jedna vrstva buniek, čo umožňuje výmenu látok medzi krvou a bunkami. Tu kyslík a živiny prechádzajú do buniek, zatiaľ čo odpadové látky idú opačným smerom.
⚠️ Pozor: Nezamieňaj si smer! Tepny = ZO srdca, Žily = DO srdca. Toto pravidlo platí vždy!
Krv - životodarná tekutina
Tvoja krv tvorí asi 5-6 litrov a skladá sa z dvoch hlavných častí. Krvná plazma (55% objemu) je žltkastá tekutina hlavne z vody, ktorá obsahuje bielkoviny, cukry, tuky a hormóny.
Krvné telieska (45% objemu) majú špecifické úlohy. Červené krvinky obsahujú hemoglobin a prenášajú kyslík - nemajú jadro a majú bicykloidný tvar. Biele krvinky sú súčasťou imunitného systému a bojujú proti infekciám.
Krvné doštičky sú úlomky buniek kľúčové pre zrážanie krvi. Krvné skupiny (ABO systém a Rh faktor) musia byť zhodné pri transfúziách, inak môže dôjsť k život ohrozujúcej reakcii.
🔴 Dôležité: Hemoglobin obsahuje železo, preto je krv červená a preto je železo v strave také potrebné!
Krvný obeh - cesta krvi telom
Malý krvný obeh začína v pravej komore srdca. Odkysličená krv ide pľúcnou tepnou do pľúc, kde sa okysličí a odovzdá oxid uhličitý. Okysličená krv sa vracia pľúcnymi žilami do ľavej predsiene.
Veľký krvný obeh začína v ľavej komore, kde sa okysličená krv pumpuje do aorty. Tá sa rozvetvuje na menšie tepny vedúce do všetkých orgánov. Vo vlásočniciach sa odovzdá kyslík a živiny bunkám.
Odkysličená krv sa zbiera do žíl, ktoré sa spájajú do hornej a dolnej dutej žily. Tie privádzajú krv späť do pravej predsiene srdca, a celý cyklus sa opakuje. Tento dvojitý systém zabezpečuje efektívny transport po celom tele.
🔄 Predstav si: Jedna kvapka krvi prejde celým telom približne za minútu!
Krvný tlak, pulz a zdravie srdca
Krvný tlak sa meria v dvoch hodnotách. Systolický tlak (vyššie číslo) je tlak pri stiahnutí srdca, diastolický (nižšie) pri uvoľnení. Normálny tlak je okolo 120/80 mmHg.
Pulz je počet úderov srdca za minútu - v pokoji asi 60-80, pri námahe sa zvyšuje. Môžeš ho cítiť na zápästí alebo krku. Je to jednoduchý spôsob, ako kontrolovať zdravie srdca.
Chorobám srdca a ciev môžeš predchádzať zdravým životným štýlom. Pravidelný pohyb, zdravá strava s obmedzeným tukom a soľou, nefajčenie a zvládanie stresu sú kľúčové.
💪 Motivácia: Tvoje srdce je sval - čím viac ho trénuješ pohybom, tým silnejšie a zdravšie bude!
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Where can I download the Knowunity app?
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Is Knowunity really free of charge?
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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
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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
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
Obehová sústava: Prenos látok v tele a starostlivosť o srdce
Obehová sústava je tvoj životne dôležitý transportný systém - predstav si ju ako diaľničnú sieť, ktorá neustále rozváža kyslík a živiny po celom tele. Bez nej by tvoje bunky nemohli fungovať a ty by si neprežil.
Prehľad obehovej sústavy
Tvoja obehová sústava je ako perfektne zorganizovaná doručovacia služba. Jej hlavnou úlohou je transport kyslíka, živín a hormónov do všetkých buniek, plus odvoz odpadu ako oxid uhličitý.
Systém sa skladá z troch kľúčových častí: srdca (motor celého systému), ciev (cesty pre krv) a krvi (tekuté tkanivo s mnohými funkciami). Rozlišujeme dva hlavné typy obehu - malý krvný obeh do pľúc na okysličenie krvi a veľký krvný obeh do celého tela.
Krvný tlak je sila, ktorou krv tlačí na steny ciev, a pulz ti ukazuje, koľkokrát za minútu tvoje srdce bije. Tieto hodnoty sú dôležité indikátory tvojho zdravia.
💡 Tip: Tvoje srdce je asi také veľké ako tvoja zaťatá päsť a bije približne 100 000-krát denne!
Sign up to see the contentIt's free!
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Srdce - náš motor
Tvoje srdce je dutý svalový orgán rozdelený na štyri dutiny. Dve predsiene prijímajú krv a dve komory ju vypudzujú ven. Medzi nimi sú chlopne, ktoré zabezpečujú tok krvi len jedným smerom.
Srdcový cyklus má dva hlavné kroky. Počas diastoly sa srdce uvoľní a naplní krvou. Pri systole sa srdce stiahne a vypudí krv do ciev - najprv sa stiahnu predsiene, potom komory.
Ľavá komora má najhrubšiu stenu, pretože musí pumpovať krv do celého tela pod vysokým tlakom. Pravá strana srdca pracuje s nižším tlakom, keďže posiela krv len do pľúc.
💡 Zaujímavosť: Tvoje srdce nepotrebuje signály z mozgu na bitie - má vlastný "vodič tempa" v srdcovom svale!
Sign up to see the contentIt's free!
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Cievy - krvné diaľnice
Máš tri hlavné typy ciev s rôznymi funkciami. Tepny vedú krv zo srdca a majú hrubé, pružné steny, aby vydržali vysoký tlak. Väčšinou prenášajú okysličenú krv, výnimkou je pľúcna tepna.
Žily vedú krv do srdca a majú tenšie steny ako tepny. Obsahujú chlopne, hlavne v končatinách, ktoré bránia spätnému toku kvôli gravitácii. Väčšinou prenášajú odkysličenú krv, okrem pľúcnych žíl.
Vlásočnice sú najtenšie cievy s jedinečnou funkciou. Ich stena je len jedna vrstva buniek, čo umožňuje výmenu látok medzi krvou a bunkami. Tu kyslík a živiny prechádzajú do buniek, zatiaľ čo odpadové látky idú opačným smerom.
⚠️ Pozor: Nezamieňaj si smer! Tepny = ZO srdca, Žily = DO srdca. Toto pravidlo platí vždy!
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Krv - životodarná tekutina
Tvoja krv tvorí asi 5-6 litrov a skladá sa z dvoch hlavných častí. Krvná plazma (55% objemu) je žltkastá tekutina hlavne z vody, ktorá obsahuje bielkoviny, cukry, tuky a hormóny.
Krvné telieska (45% objemu) majú špecifické úlohy. Červené krvinky obsahujú hemoglobin a prenášajú kyslík - nemajú jadro a majú bicykloidný tvar. Biele krvinky sú súčasťou imunitného systému a bojujú proti infekciám.
Krvné doštičky sú úlomky buniek kľúčové pre zrážanie krvi. Krvné skupiny (ABO systém a Rh faktor) musia byť zhodné pri transfúziách, inak môže dôjsť k život ohrozujúcej reakcii.
🔴 Dôležité: Hemoglobin obsahuje železo, preto je krv červená a preto je železo v strave také potrebné!
Sign up to see the contentIt's free!
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Krvný obeh - cesta krvi telom
Malý krvný obeh začína v pravej komore srdca. Odkysličená krv ide pľúcnou tepnou do pľúc, kde sa okysličí a odovzdá oxid uhličitý. Okysličená krv sa vracia pľúcnymi žilami do ľavej predsiene.
Veľký krvný obeh začína v ľavej komore, kde sa okysličená krv pumpuje do aorty. Tá sa rozvetvuje na menšie tepny vedúce do všetkých orgánov. Vo vlásočniciach sa odovzdá kyslík a živiny bunkám.
Odkysličená krv sa zbiera do žíl, ktoré sa spájajú do hornej a dolnej dutej žily. Tie privádzajú krv späť do pravej predsiene srdca, a celý cyklus sa opakuje. Tento dvojitý systém zabezpečuje efektívny transport po celom tele.
🔄 Predstav si: Jedna kvapka krvi prejde celým telom približne za minútu!
Sign up to see the contentIt's free!
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Krvný tlak, pulz a zdravie srdca
Krvný tlak sa meria v dvoch hodnotách. Systolický tlak (vyššie číslo) je tlak pri stiahnutí srdca, diastolický (nižšie) pri uvoľnení. Normálny tlak je okolo 120/80 mmHg.
Pulz je počet úderov srdca za minútu - v pokoji asi 60-80, pri námahe sa zvyšuje. Môžeš ho cítiť na zápästí alebo krku. Je to jednoduchý spôsob, ako kontrolovať zdravie srdca.
Chorobám srdca a ciev môžeš predchádzať zdravým životným štýlom. Pravidelný pohyb, zdravá strava s obmedzeným tukom a soľou, nefajčenie a zvládanie stresu sú kľúčové.
💪 Motivácia: Tvoje srdce je sval - čím viac ho trénuješ pohybom, tým silnejšie a zdravšie bude!
Sign up to see the contentIt's free!
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Sign up to see the contentIt's free!
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Improve your grades
Join milions of students
Sign up to see the contentIt's free!
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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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4.7/5
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