Obehová sústava je tvoj životne dôležitý transportný systém - predstav... Show more
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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!
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the 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 Biológia
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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
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
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
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
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 app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
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
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
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
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
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 app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
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!
Sign up to see the contentIt's free!
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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!
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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!
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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!
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 specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the 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
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
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
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
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 app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
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
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
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
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
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 app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user