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Jan 15, 2026
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Simple Guide to Passive Transport: Types, Examples, and Solutions for Kids
Ria
@ia_gzyy
Passive Cell Transport (Part 2)
This section continues the exploration of passive cell transport, focusing on hypertonic solutions and facilitated diffusion.
Osmosis: Hypertonic Solution
Definition: A hypertonic solution has a higher solute concentration outside the cell compared to inside the cell.
In a hypertonic environment, water rushes out of the cell, causing it to shrivel or shrink.
Example: When a plant cell is placed in a salt solution, it may undergo plasmolysis due to the hypertonic environment.
Facilitated Diffusion
Facilitated diffusion is a form of passive transport that uses transport proteins to assist in moving molecules across the cell membrane.
Definition: Facilitated diffusion is similar to simple diffusion but utilizes channel or carrier proteins to help move molecules that normally couldn't pass through the membrane on their own.
Like simple diffusion, facilitated diffusion still moves molecules from areas of high concentration to areas of low concentration.
Example: Glucose and amino acids often enter cells through facilitated diffusion.
Channel Proteins
Channel proteins are a type of integral protein embedded in the cell membrane. They form pores through which specific molecules can pass.
Highlight: Molecules move randomly through these pores, following their concentration gradient.
Carrier Proteins
Carrier proteins are another type of integral protein involved in facilitated diffusion. They change shape to move materials from one side of the membrane to the other.
Highlight: Some carrier proteins extend completely through the membrane, while others do not.
Glucose Transport
Glucose, being a larger molecule, requires assistance to move across the cell membrane.
Example: Glucose moves from areas of high concentration to low concentration using either channel or carrier proteins in a process of facilitated diffusion.
Highlight: Does facilitated diffusion require energy? No, facilitated diffusion is a passive process that does not require energy input from the cell.
Passive Cell Transport (Part 1)
Passive cell transport is a crucial biological process that allows cells to maintain equilibrium without expending energy. This section explores the fundamental concepts of passive transport, including simple diffusion and osmosis.
Definition: Passive cell transport equilibrium refers to the state where there is an equal concentration of solutes on both sides of the cell membrane.
Cells naturally strive to achieve this equilibrium. Passive transport occurs without the need for energy expenditure, as molecules move down the concentration gradient from areas of high solute concentration to areas of low concentration.
Highlight: A concentration gradient, which is an unequal distribution of solutes across the membrane, is essential for passive transport to occur.
Simple Diffusion
Simple diffusion is a type of passive transport where molecules (either fluid or gas) move from an area of high concentration to an area of low concentration until equilibrium is reached.
Example: Common examples of simple diffusion include the movement of oxygen, carbon dioxide, and other small molecules across cell membranes.
Osmosis
Osmosis is a specific form of simple diffusion that involves the movement of water molecules across the cell membrane.
Definition: Osmosis is the diffusion of water from an area of high water potential (low solute concentration) to an area of low water potential (high solute concentration).
This process is often likened to a "water slide," as water naturally moves from high to low potential without requiring energy input.
Osmotic Conditions
Isotonic Solution
Definition: An isotonic solution has equal concentrations of solutes inside and outside the cell.
In an isotonic environment, water moves both in and out of the cell at an equal rate, maintaining equilibrium.
Hypotonic Solution
Definition: A hypotonic solution has a lower solute concentration outside the cell compared to inside the cell.
In a hypotonic environment, water rushes into the cell, causing it to swell. This is often compared to a hippo's large size.
Example: When a plant cell is placed in pure water, it becomes turgid due to the hypotonic environment.
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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
homepage/newPositiveReviewText6
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
homepage/newPositiveReviewText6
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
Simple Guide to Passive Transport: Types, Examples, and Solutions for Kids
Ria
@ia_gzyy
Passive cell transport is a fundamental process in cellular biology, involving the movement of molecules across cell membranes without energy expenditure. This process is driven by concentration gradients and includes simple diffusion, osmosis, and facilitated diffusion. Understanding these mechanisms is... Show more
Passive Cell Transport (Part 2)
This section continues the exploration of passive cell transport, focusing on hypertonic solutions and facilitated diffusion.
Osmosis: Hypertonic Solution
Definition: A hypertonic solution has a higher solute concentration outside the cell compared to inside the cell.
In a hypertonic environment, water rushes out of the cell, causing it to shrivel or shrink.
Example: When a plant cell is placed in a salt solution, it may undergo plasmolysis due to the hypertonic environment.
Facilitated Diffusion
Facilitated diffusion is a form of passive transport that uses transport proteins to assist in moving molecules across the cell membrane.
Definition: Facilitated diffusion is similar to simple diffusion but utilizes channel or carrier proteins to help move molecules that normally couldn't pass through the membrane on their own.
Like simple diffusion, facilitated diffusion still moves molecules from areas of high concentration to areas of low concentration.
Example: Glucose and amino acids often enter cells through facilitated diffusion.
Channel Proteins
Channel proteins are a type of integral protein embedded in the cell membrane. They form pores through which specific molecules can pass.
Highlight: Molecules move randomly through these pores, following their concentration gradient.
Carrier Proteins
Carrier proteins are another type of integral protein involved in facilitated diffusion. They change shape to move materials from one side of the membrane to the other.
Highlight: Some carrier proteins extend completely through the membrane, while others do not.
Glucose Transport
Glucose, being a larger molecule, requires assistance to move across the cell membrane.
Example: Glucose moves from areas of high concentration to low concentration using either channel or carrier proteins in a process of facilitated diffusion.
Highlight: Does facilitated diffusion require energy? No, facilitated diffusion is a passive process that does not require energy input from the cell.
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
Passive Cell Transport (Part 1)
Passive cell transport is a crucial biological process that allows cells to maintain equilibrium without expending energy. This section explores the fundamental concepts of passive transport, including simple diffusion and osmosis.
Definition: Passive cell transport equilibrium refers to the state where there is an equal concentration of solutes on both sides of the cell membrane.
Cells naturally strive to achieve this equilibrium. Passive transport occurs without the need for energy expenditure, as molecules move down the concentration gradient from areas of high solute concentration to areas of low concentration.
Highlight: A concentration gradient, which is an unequal distribution of solutes across the membrane, is essential for passive transport to occur.
Simple Diffusion
Simple diffusion is a type of passive transport where molecules (either fluid or gas) move from an area of high concentration to an area of low concentration until equilibrium is reached.
Example: Common examples of simple diffusion include the movement of oxygen, carbon dioxide, and other small molecules across cell membranes.
Osmosis
Osmosis is a specific form of simple diffusion that involves the movement of water molecules across the cell membrane.
Definition: Osmosis is the diffusion of water from an area of high water potential (low solute concentration) to an area of low water potential (high solute concentration).
This process is often likened to a "water slide," as water naturally moves from high to low potential without requiring energy input.
Osmotic Conditions
Isotonic Solution
Definition: An isotonic solution has equal concentrations of solutes inside and outside the cell.
In an isotonic environment, water moves both in and out of the cell at an equal rate, maintaining equilibrium.
Hypotonic Solution
Definition: A hypotonic solution has a lower solute concentration outside the cell compared to inside the cell.
In a hypotonic environment, water rushes into the cell, causing it to swell. This is often compared to a hippo's large size.
Example: When a plant cell is placed in pure water, it becomes turgid due to the hypotonic environment.
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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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
homepage/newPositiveReviewText6
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
homepage/newPositiveReviewText6
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