Your body is basically a massive city made up of... Show more
SociologySign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
2
0
๐ฟ๐ฝ๐ฟ
12/1/2025
Biology
Cells
23
โข
Dec 1, 2025
โข
Understanding the Basics of Cells: Their Types and Functions
1 / 5
What Are Cells?
Think of cells as the LEGO bricks of life - they're the smallest units that make up every living thing on Earth. You've got trillions of these little powerhouses working 24/7 inside your body right now!
Each cell contains your genetic information (basically your body's instruction manual), but different types have completely different jobs. It's like having a massive workforce where everyone has their own specialty.
Quick Fact: You're literally made of trillions of cells working together - that's more cells than there are stars in our galaxy!
The main types you need to know about include red blood cells, white blood cells, T-cells, stem cells, plus prokaryotic and eukaryotic cells. Each one has its own superpower that keeps you healthy and alive.
Red Blood Cells - Your Body's Delivery Service
Red blood cells (also called erythrocytes) are absolute legends - they're the most common cells in your entire body! Their main job is being your personal oxygen delivery service and carbon dioxide removal team.
These disc-shaped cells pick up oxygen from your lungs and taxi it around to every part of your body that needs it. Then they collect the waste carbon dioxide and bring it back to your lungs so you can breathe it out.
Your bone marrow (the spongy stuff inside your bones) is like a red blood cell factory, constantly making fresh ones. Each red blood cell works hard for about 120 days (roughly 4 months) before it gets tired and dies.
Remember This: Without red blood cells, your body would be like a city with no delivery trucks - nothing would get where it needs to go!
White Blood Cells and T-Cells - Your Personal Bodyguards
White blood cells (leukocytes) are basically your body's security team. They patrol your bloodstream looking for troublemakers like bacteria, viruses, and other nasty invaders that could make you sick.
When you get a cut or infection, these cellular heroes rush to the scene to fight off germs and help your body heal. They're why that scraped knee eventually stops being red and painful!
T-cells are special types of white blood cells that are particularly good at hunting down specific threats. Like white blood cells, they're made in your bone marrow and are part of your immune system's elite forces.
Cool Connection: Ever wondered why you don't get the same cold twice? Your T-cells remember previous invaders and can fight them off faster next time!
Prokaryotic vs Eukaryotic Cells - The Basic vs Advanced Models
Prokaryotic cells are like the basic model of cellular life - they're single-celled organisms that don't have a nucleus (control centre). Think of bacteria - they're simple but incredibly effective at surviving.
These cells have their DNA floating freely inside, which lets them carry out biochemical reactions in their cytoplasm . Simple but brilliant!
Eukaryotic cells are the advanced version - they're multicellular and have a proper nucleus to store their DNA safely. These cells can reproduce themselves through mitosis (cell division).
Easy Memory Trick: Pro = basic/simple, Eu = fancy/complex. Prokaryotic cells are the basic models, eukaryotic cells are the luxury versions!
The main job of eukaryotic cells is self-preservation (staying alive) and self-reproduction (making copies of themselves).
Stem Cells - The Shape-Shifters
Stem cells are absolutely mind-blowing - they're like the ultimate shape-shifters of the cellular world! These special cells can transform into literally any other type of cell your body needs.
Scientists are fascinated by stem cells because they could potentially help treat serious diseases like cancer and heart disease. The research is still ongoing, but the possibilities are incredible.
Stem cell research has even shown it might be possible to grow organs or tissues in labs. While human cloning remains controversial and largely theoretical, the medical applications could revolutionise how we treat illnesses.
Future Focus: Understanding stem cells now could help you appreciate the amazing medical breakthroughs that might happen in your lifetime!
These cellular superstars represent hope for millions of people with currently incurable conditions.
We thought youโd 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 โ all at your fingertips.
Most popular content: Stem Cells
Most popular content in Biology
Most popular content
Can't find what you're looking for? Explore other subjects.
Students love us โ and so will you.
4.9/5
App Store
4.8/5
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 itโs very much worth it and youโll 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 donโt get it!!! In the end I think itโs worth it ๐๐ โ ๏ธAlso DID I MENTION ITS FREEE YOU DONโT HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLYโ๏ธโ๏ธโ ๏ธ
Thomas R
iOS user
Knowunity is the BEST app Iโve 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 help๐ค๐ค
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.๐๐ฉท๐
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH ๐๐๐ฒ๐ค๐โจ๐๐ฎ
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 Iโve 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 itโs very much worth it and youโll 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 donโt get it!!! In the end I think itโs worth it ๐๐ โ ๏ธAlso DID I MENTION ITS FREEE YOU DONโT HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLYโ๏ธโ๏ธโ ๏ธ
Thomas R
iOS user
Knowunity is the BEST app Iโve 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 help๐ค๐ค
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.๐๐ฉท๐
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH ๐๐๐ฒ๐ค๐โจ๐๐ฎ
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 Iโve seen! Geometry too!
Paul T
iOS user
Understanding the Basics of Cells: Their Types and Functions
Your body is basically a massive city made up of trillions of tiny building blocks called cells! These microscopic units are what keep you alive and functioning every single day, from carrying oxygen around your body to fighting off that... Show more
What Are Cells?
Think of cells as the LEGO bricks of life - they're the smallest units that make up every living thing on Earth. You've got trillions of these little powerhouses working 24/7 inside your body right now!
Each cell contains your genetic information (basically your body's instruction manual), but different types have completely different jobs. It's like having a massive workforce where everyone has their own specialty.
Quick Fact: You're literally made of trillions of cells working together - that's more cells than there are stars in our galaxy!
The main types you need to know about include red blood cells, white blood cells, T-cells, stem cells, plus prokaryotic and eukaryotic cells. Each one has its own superpower that keeps you healthy and alive.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Red Blood Cells - Your Body's Delivery Service
Red blood cells (also called erythrocytes) are absolute legends - they're the most common cells in your entire body! Their main job is being your personal oxygen delivery service and carbon dioxide removal team.
These disc-shaped cells pick up oxygen from your lungs and taxi it around to every part of your body that needs it. Then they collect the waste carbon dioxide and bring it back to your lungs so you can breathe it out.
Your bone marrow (the spongy stuff inside your bones) is like a red blood cell factory, constantly making fresh ones. Each red blood cell works hard for about 120 days (roughly 4 months) before it gets tired and dies.
Remember This: Without red blood cells, your body would be like a city with no delivery trucks - nothing would get where it needs to go!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
White Blood Cells and T-Cells - Your Personal Bodyguards
White blood cells (leukocytes) are basically your body's security team. They patrol your bloodstream looking for troublemakers like bacteria, viruses, and other nasty invaders that could make you sick.
When you get a cut or infection, these cellular heroes rush to the scene to fight off germs and help your body heal. They're why that scraped knee eventually stops being red and painful!
T-cells are special types of white blood cells that are particularly good at hunting down specific threats. Like white blood cells, they're made in your bone marrow and are part of your immune system's elite forces.
Cool Connection: Ever wondered why you don't get the same cold twice? Your T-cells remember previous invaders and can fight them off faster next time!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Prokaryotic vs Eukaryotic Cells - The Basic vs Advanced Models
Prokaryotic cells are like the basic model of cellular life - they're single-celled organisms that don't have a nucleus (control centre). Think of bacteria - they're simple but incredibly effective at surviving.
These cells have their DNA floating freely inside, which lets them carry out biochemical reactions in their cytoplasm . Simple but brilliant!
Eukaryotic cells are the advanced version - they're multicellular and have a proper nucleus to store their DNA safely. These cells can reproduce themselves through mitosis (cell division).
Easy Memory Trick: Pro = basic/simple, Eu = fancy/complex. Prokaryotic cells are the basic models, eukaryotic cells are the luxury versions!
The main job of eukaryotic cells is self-preservation (staying alive) and self-reproduction (making copies of themselves).
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Stem Cells - The Shape-Shifters
Stem cells are absolutely mind-blowing - they're like the ultimate shape-shifters of the cellular world! These special cells can transform into literally any other type of cell your body needs.
Scientists are fascinated by stem cells because they could potentially help treat serious diseases like cancer and heart disease. The research is still ongoing, but the possibilities are incredible.
Stem cell research has even shown it might be possible to grow organs or tissues in labs. While human cloning remains controversial and largely theoretical, the medical applications could revolutionise how we treat illnesses.
Future Focus: Understanding stem cells now could help you appreciate the amazing medical breakthroughs that might happen in your lifetime!
These cellular superstars represent hope for millions of people with currently incurable conditions.
We thought youโd 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 โ all at your fingertips.
2
Smart Tools NEW
Transform this note into: โ 50+ Practice Questions โ Interactive Flashcards โ Full Mock Exam โ Essay Outlines
Mock Exam
Quiz
Flashcards
Essay
Similar Content
Cell Type Comparison
Explore the fundamental differences between prokaryotic and eukaryotic cells, including their structure, size, genetic material, and methods of division. This summary provides a clear comparison of bacterial cells and those of animals, plants, and fungi, highlighting key characteristics essential for understanding cell biology.
Biology10
Cell Biology Essentials
Explore the fundamental concepts of cell biology, including eukaryotic and prokaryotic cells, specialized cell functions, and key processes like osmosis and mitosis. This summary provides a comprehensive overview for Paper 1 revision, focusing on cell structure, differentiation, and transport mechanisms. Ideal for students preparing for biology exams.
Biology11
Prokaryotic vs Eukaryotic Cells
Explore the key differences and similarities between prokaryotic and eukaryotic cells, including their structures, organelles, and functions. This summary highlights essential concepts such as cell membranes, nuclei, and organelle presence, making it a valuable resource for understanding cellular biology.
Biology8
Cell Structures Overview
Explore the essential components and functions of prokaryotic and eukaryotic cells, including plant and bacterial cell structures. This summary covers chloroplasts, mitochondria, ribosomes, and more, providing a clear understanding of cellular processes. Ideal for AQA Combined Science Foundation Level students.
Biology9
Biology - cells
Eukaryotes and prokaryotes
Biology11
Cellular Biology Essentials
Explore the fundamental concepts of cellular biology, focusing on the differences between eukaryotic and prokaryotic cells. This summary covers key structures such as the nucleus, cytoplasm, mitochondria, ribosomes, and chloroplasts, along with their functions in animal and plant cells. Ideal for students preparing for biology exams.
Biology11
Most popular content: Stem Cells
Most popular content in Biology
Most popular content
Can't find what you're looking for? Explore other subjects.
Students love us โ and so will you.
4.9/5
App Store
4.8/5
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 itโs very much worth it and youโll 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 donโt get it!!! In the end I think itโs worth it ๐๐ โ ๏ธAlso DID I MENTION ITS FREEE YOU DONโT HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLYโ๏ธโ๏ธโ ๏ธ
Thomas R
iOS user
Knowunity is the BEST app Iโve 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 help๐ค๐ค
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.๐๐ฉท๐
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH ๐๐๐ฒ๐ค๐โจ๐๐ฎ
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 Iโve 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 itโs very much worth it and youโll 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 donโt get it!!! In the end I think itโs worth it ๐๐ โ ๏ธAlso DID I MENTION ITS FREEE YOU DONโT HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLYโ๏ธโ๏ธโ ๏ธ
Thomas R
iOS user
Knowunity is the BEST app Iโve 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 help๐ค๐ค
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.๐๐ฉท๐
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH ๐๐๐ฒ๐ค๐โจ๐๐ฎ
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 Iโve seen! Geometry too!
Paul T
iOS user