Subjects
Biology
Chemistry
AP Chemistry
English
AP English Literature
Biology
Dec 10, 2025
149
3 pages
Mathmagican @mathmagcian
Ever wondered why you get ill and how diseases spread? Understanding health and disease is crucial for protecting... Show more
Health isn't just about not being sick - it's having complete physical, mental and social wellbeing. Your lifestyle choices like diet, sleep, exercise, stress levels and drug use all play a massive role in keeping you healthy.
When harmful microorganisms called pathogens invade your body, they can cause disease. These tiny troublemakers come in four main types bacteria, viruses, fungi and protists.
Diseases spread through five main routes vectors (like mosquitoes), contaminated water, direct touch, infected food, and through the air when people cough or sneeze.
Bacteria are microscopic single-celled organisms that you can't see without a microscope. They're more complex than viruses and contain structures like ribosomes, chromosomal DNA, cell membranes, and sometimes flagella for movement. When bacteria invade your body, they release harmful toxins that make you feel unwell.
Quick Tip Remember that not all bacteria are bad - many are actually helpful and live naturally in your body!
Viruses are much smaller than bacteria and work differently. Instead of just releasing toxins, they're like cellular hijackers - they invade your cells and force them to make copies of the virus. This continues until your poor cell becomes so packed with viruses that it literally explodes, spreading more viruses throughout your body.
A virus structure includes an envelope protein, viral genome (their genetic material), nucleocapsid, and viral tegument. Think of them as tiny, very efficient copying machines.
Fungi are more complex organisms, and whilst many species exist, only some cause human disease. Unlike bacteria and viruses, fungal infections can sometimes be contagious, spreading directly from person to person through contact.
Fungal cells are quite sophisticated, containing organelles like nuclei, mitochondria, ribosomes, and vacuoles - similar to your own cells but with some key differences like having cell walls.
Did You Know Athlete's foot and thrush are common fungal infections you might have heard of!
Protists are single-celled organisms that can cause some really nasty diseases. These clever pathogens often contaminate food and water, leading to severe intestinal infections that can make you very ill indeed.
Many protists are parasitic, which means they live in or on other organisms (like you!) and benefit at your expense. The most famous example is malaria, which kills hundreds of thousands of people worldwide each year.
Protist cells are quite complex for single-celled organisms. They contain structures like chloroplasts (in some species), nuclei, flagella for movement, eyespots for detecting light, and contractile vacuoles that help them survive in different environments.
What makes protists particularly dangerous is their ability to adapt and survive in harsh conditions. They can often survive outside the human body for extended periods, making them excellent at spreading through contaminated water sources.
Stay Safe Always drink clean water when travelling abroad, as protist infections are more common in areas with poor sanitation!
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.
You can download the app in the Google Play Store and in the Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
8
Smart Tools NEW
Transform this note into: ✓ 50+ Practice Questions ✓ Interactive Flashcards ✓ Full Mock Exam ✓ Essay Outlines
Unit 6: The Human Body Module 22: Integumentary, Skeletal, and Muscular Systems Lesson 2: The Skeletal System Lesson 3: The Muscular System Biology 9A
Biology3.6.3 Skeletal Muscles
BiologyNotes describing different bacteria types and their effects
BiologyFor the IB Biology course
BiologyDiscussion on how life is organized.
BiologyDiscussed here are the characteristics of living things, big ideas in biology, information and heredity, and unity and diversity of life.
BiologyApp Store
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 THE SCHOOLGPT. 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 THE SCHOOLGPT. 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
Mathmagican
@mathmagcian
Ever wondered why you get ill and how diseases spread? Understanding health and disease is crucial for protecting yourself and others from harmful microorganisms called pathogens.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Health isn't just about not being sick - it's having complete physical, mental and social wellbeing. Your lifestyle choices like diet, sleep, exercise, stress levels and drug use all play a massive role in keeping you healthy.
When harmful microorganisms called pathogens invade your body, they can cause disease. These tiny troublemakers come in four main types: bacteria, viruses, fungi and protists.
Diseases spread through five main routes: vectors (like mosquitoes), contaminated water, direct touch, infected food, and through the air when people cough or sneeze.
Bacteria are microscopic single-celled organisms that you can't see without a microscope. They're more complex than viruses and contain structures like ribosomes, chromosomal DNA, cell membranes, and sometimes flagella for movement. When bacteria invade your body, they release harmful toxins that make you feel unwell.
Quick Tip: Remember that not all bacteria are bad - many are actually helpful and live naturally in your body!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Viruses are much smaller than bacteria and work differently. Instead of just releasing toxins, they're like cellular hijackers - they invade your cells and force them to make copies of the virus. This continues until your poor cell becomes so packed with viruses that it literally explodes, spreading more viruses throughout your body.
A virus structure includes an envelope protein, viral genome (their genetic material), nucleocapsid, and viral tegument. Think of them as tiny, very efficient copying machines.
Fungi are more complex organisms, and whilst many species exist, only some cause human disease. Unlike bacteria and viruses, fungal infections can sometimes be contagious, spreading directly from person to person through contact.
Fungal cells are quite sophisticated, containing organelles like nuclei, mitochondria, ribosomes, and vacuoles - similar to your own cells but with some key differences like having cell walls.
Did You Know: Athlete's foot and thrush are common fungal infections you might have heard of!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Protists are single-celled organisms that can cause some really nasty diseases. These clever pathogens often contaminate food and water, leading to severe intestinal infections that can make you very ill indeed.
Many protists are parasitic, which means they live in or on other organisms (like you!) and benefit at your expense. The most famous example is malaria, which kills hundreds of thousands of people worldwide each year.
Protist cells are quite complex for single-celled organisms. They contain structures like chloroplasts (in some species), nuclei, flagella for movement, eyespots for detecting light, and contractile vacuoles that help them survive in different environments.
What makes protists particularly dangerous is their ability to adapt and survive in harsh conditions. They can often survive outside the human body for extended periods, making them excellent at spreading through contaminated water sources.
Stay Safe: Always drink clean water when travelling abroad, as protist infections are more common in areas with poor sanitation!
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.
You can download the app in the Google Play Store and in the Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
8
Smart Tools NEW
Transform this note into: ✓ 50+ Practice Questions ✓ Interactive Flashcards ✓ Full Mock Exam ✓ Essay Outlines
Unit 6: The Human Body Module 22: Integumentary, Skeletal, and Muscular Systems Lesson 2: The Skeletal System Lesson 3: The Muscular System Biology 9A
Biology3.6.3 Skeletal Muscles
BiologyNotes describing different bacteria types and their effects
BiologyFor the IB Biology course
BiologyDiscussion on how life is organized.
BiologyDiscussed here are the characteristics of living things, big ideas in biology, information and heredity, and unity and diversity of life.
BiologyApp Store
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 THE SCHOOLGPT. 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 THE SCHOOLGPT. 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
Sociology