Cell Membrane Transport - Transport Across A Membrane - How Do Things Move Across A Cell Membrane
Вставка
- Опубліковано 13 тра 2024
- In this video we discuss the different ways how substances transport across a cell membrane, including facilitated diffusion, channel mediated diffusion, carrier mediated diffusion, simple diffusion, passive transport and active transport.
Transcript/Notes (partial)
Substances move into and out of a cell through several different processes called membrane transport. There are two main processes, passive transport processes and active transport processes. The main difference between the two is that passive processes do not require energy expenditure and active processes do require cells to expend energy.
Lets start by looking at the passive processes, which include simple diffusion, facilitated diffusion and osmosis.
Diffusion is the movement of a substance from where it has a high concentration to where it has a low concentration, or the tendency of a substance to spread out evenly over a given space.
Simple diffusion occurs with solutes that are small and non polar. By being non polar they can move in between the phosphoipid molecules that form the plasma membrane because the interior region of the membrane is non polar. Some of the materials that move by simple diffusion include the gases O2, CO2, and small fatty acids. So, if there is a higher concentration of oxygen O2 molecules outside of a cell, they can move down the concentration gradient, across the membrane without assistance, and into the cell as long as the concentration gradient exists.
The second type of diffusion is facilitated diffusion. This applies to solutes that are small and either charged or polar. Because these solutes are polar, the non polar phospholipid bilayer blocks them from passing through the membrane and into or out of the cell by simple diffusion. However, they can pass into and out of the cell with the assistance of plasma membrane proteins through a process called facilitated diffusion. There are two types of facilitated diffusion, channel mediated diffusion and carrier mediated diffusion. The difference between the two is the type of transport protein used to move the substance across the membrane.
Channel mediated diffusion is when a ion, which is a charged particle where its total number of electrons does not equal its total number of protons giving it a positive or negative charge, moves across the membrane through a water filled protein channel. Each protein channel is typically specific for one type of ion, and there are two types of channels, a leak channel, which is continuously open, and a gated channel, which only opens due to a stimulus, and only stays open for a fraction of a second.
Carrier mediated diffusion involves the movement of polar molecules such as simple sugars or simple carbohydrates and amino acids across the membrane. This is accomplished by a carrier protein, which actually changes shape in the process. For instance glucose binds to a carrier protein, which changes shape and moves the glucose molecule to the other side of the membrane.
Now for osmosis. Osmosis is the passive movement of water through a selectively permeable membrane. This occurs when there is a difference in concentration of water on either side of the membrane. This can happen in one of two ways, water can slip between the phospholipid molecules that make up the plasma membrane, or through integral protein water channels that are called aquaporins.
Now lets look at active processes. As stated earlier, active processes require the use of cellular energy for membrane transport. There are two types of active processes, active transport and vesicular transport. Active transport is the movement of a solute against its concentration gradient, or going from an area of low concentration to a place of higher concentration. Vesicular transport is the transport of large substances across the plasma membrane by a vesicle, which is a membrane bound sac filled with materials.
Active transport has two types, primary active transport and secondary active transport.
In primary active transport cellular protein pumps called ion pumps move ions across the membrane, against their concentration gradient.
Timestamps
0:00 The structure of cell membranes
0:42 The 2 main membrane transport processes (passive and active)
1:12 What is diffusion?
2:11 Simple diffusion
3:05 Facilitated diffusion
3:44 Channel mediated diffusion
4:29 Carrier mediated diffusion
4:51 What is osmosis?
5:49 Active processes
6:01 Active transport
6:12 Vesicular transport
6:28 Primary active transport
7:27 Secondary active transport
8:37 The 2 types of vesicular transport
8:53 Exocytosis
9:23 Endocytosis
There is a special place in heaven for people that make science this simple ! YOU are the special place itself :D
Thanks ExoticEgyptianBeauty.
I guess all we can do is to hope there is a heaven!
@@whatsupdude2778 sir i read this topic three times but can't understand like this
Thank you so much! This is so organized and easily understood! Much useful than my professor's endless talks.
You are welcome, and thanks for watching.
Hey there
ua-cam.com/video/do4R2zLsXOs/v-deo.html
Transport in cell
This is the best video I've ever seen. So detailed yet very easy to understand.
I stared at my textbook, trying to learn the various Membrane Transport Processes. You made it all make sense! Thank you! I will probably get an A on my test!
Awesome Elizabeth, I do sense an A coming your way.
I just tested on it now! I am serious. I made 100!!!!!
This is the best video related to transport across cell membrane that I have seen on UA-cam.
so helpful! learned way more in 10 mins than i did in my 1 hour+ lecture! tysm
example with each process was really helpful. Thank you for taking out time to make science easy for us
Everyone already said what I wanted or was thinking to say . A thank you isn't enough words aren't enough. But that's all I got for now. Thank you for making it so enjoyable and understandable and not boring like my professor.
I agree
This video is from a qr code in my textbook.I scanned it and never regretted my descision
Loved the simple yet understandable explanation! ✨💕God bless souls like you 😭❤️
Very well explained and easy to understand, the animated diagrams made it so easy, you are an excellent teacher
Thanks for the kind words zinhle Mzobe, great to hear the video helped ya.
this is the best cell membrane transport video on UA-cam. Thank you for making this content.🙂
The rest comments already express my feelings yo you Mr.....all left for me is to like all coments coz ur good for sure
it took 10 minutes to explain something that my tutor couldn't do in over 2 hours.. you are a god.
Thanks for the love ED khal, great to hear the video helped ya.
fact
don't praise him that way it is a sin he can never be a God for only explaining something to u .GOD [Allah] created everything and sent for u this man to explain for u and he is the one that deserves to be praised rather a person who didn't give u a life
Not every one is religious though
@@firdows... I also believe in God. However, this scientist deserves praise. How would you learn this perfect functioning in the cell without this scientist?
This is super helpful for my bio 11 online courses!! We get assignments but no lessons for how to complete them, and this is really saving my 'day in the life of a cell' project--thank you so much for your videos :)
Thanks for sharing that with me pink deoxys, it means a lot to hear that the videos are helping you out.
Video was good but including the transcript was greater.
Thanks, my friend, for gathering this info up in 10 minutes and not one whole boring powerpoint👏👏👏👏👍👍👍👍
You are welcome Aya Jilalu, wish they gave me more space in the description to put the whole transcript in. Thanks for watching my friend.
@@whatsupdude2778 do you have a ppt in this topic?
Wow, great explanation in just 10 mins. God bless you!
Now I understand the concept!
May God bless the person who made this video.. Finally have understood
Awesome video, the explanation of each process was simple and easy to understand and the examples were also very good.
Thank you very much sir , may God bless you all for making physiology so easy , thanks once again
Really great sir....u made concepts very clear and easy......single video equal to number of teacher's......thank you sooo much sir🙏🙏😊
This video was one of the best ones I have ever watched about biology. Thanks a lot🌹🌸
Thank You So Much. I felt lost but now I feel I have a chance to actually understand what I'm studying.
This is what I was searching for. Thank you very very much dear.
Appreciate your work..... Thank you So much for making science so easy.... ♥️
Even I have not words to explain how this Video helps me , thank you so much gentleman.
Thanks for letting me know that, great to hear the video helped you out.
Thank you very much for your detailed explanations. Really helped.
Thank you! Very easy to understand and well organised.
Well done dude, you deserve a gift much love
Thank you so much. Your explanation is excellent. I admire your work.
Absolutely awesome! Your explanation and animations are just amazing
So useful! Thanks! This video equlibrades with 3h of studying
thank you so much the way u pronounce words and explain is amazing !
Thanks That One Guy.
U made it so much easier to understand 😢😢😢 thank you!
Awesome.. hats off for simplified and effective explanation of tough topic🙌👏👏
This is lovely, thanks, you are blessed! I enjoyed this video.
Super helpful. I understand the unit now and will pass this quiz. Thank you!
You're AMAZING. THANK YOU SIR! ❤
Thanks to your channel.
It was complete and easy to understand
Thank you🙌🏼🙌🏼🙌🏼 best explanation ever!!
the best video of membrane transport ever posted in youtube,tnx dude
Thanks Ol music!
Thank you so much so, i clearly understand all about transport across cell membrane.....
God bless you lmao my test is tom and I don't know anything but this gon save my life
Studying for my test and I THANK YOU for explaining what my Professor and tutor couldn't help me understand. Your voice, explanation and transcript is amazing.
Awesome, great to hear the video helped ya, thanks for watching my friend.
thx so so so much, helps me a lot with my biology class!
Thank you so much for uploading such an informative video this is helpful in preparing my lecture.
Thank you so much!this video teach me more than my teacher did in 1 hour class and every thing is very comprehensive.
Great to hear, thanks for letting me know that, and thanks for watching.
@@whatsupdude2778 I should thank you for making this video.
Oh cover so much lengthy and complicated so much easy and simple within few minutes thank you so much
Finally I found one of the best tutorial video which is very helpful and understandable. Thank you, sir .
Glad it was helpful!
really thanks a lot. here from Egypt
You really have helped me a lot! Thanks a lot!!🖤
Thank u so much. This video was very helpful. I also love the animation
Easy to understand... thanks sir from core of my heart
You are welcome, thanks for watching my friend.
You deserve a reward you are Life saver you should make more
Amazing video! Thank you so much
Best one I ever found on UA-cam ❤❤❤
Thanks for explaining in an easy way
Nice video dude! Thanks for creating this👍
awesome aniamtion with schematic and diagramatic representation
beautifully explained.. thanks
That is how something simplified 😊 Well done
I have a three-chapter test next Wednesday and this information is helping me. I'm still confused, but I will watch this video a few times until I finally understand the whole process.
Same ! But my exam is tomorrow!
Excellently explained!!
Hats off!!
Seriously man! This is wayyy too good ..you r brillliant!! Once again thanks man😀😀
You are welcome Sijal Niraula, thanks for watching.
Thanks for sharing this important information with us ✨✨✨
I can't thank you enough for this!
Thank you,you helped me for my test!
you are a God. thank u for this video! you explained it perfectly! I actually learned more in this video than my book!
You are welcome Ashbby Alvarado, and thanks for watching.
Don't know how to thank you, this video is the best.
You are welcome Oryza sativa, thanks for watching, great to hear the video helped you out.
Thank you so much, this video helps me to do my homework :)
Thanks a lot... I really appreciate your hard work.
Thnk u so much for explaining in very simple way😊
جميل جدا اكثير بفهم شرحك .very nice ,l understand your explanation 💚
thanks a lot....... This wil definitely help me a lot for my NEET Examination.....
Love from India ❤❤❤❤❤❤❤
Thank you soo much for the simple yet understandable explanation. I feel like I'm starting to like biology now haha. God bless you!
Me toooo
one of my best lectures. thank you so much, your teachings are so amazing
Thanks Ihezie Tochi, great to hear the videos are helping you.
No words to say sir... It helps me alot... Boyoned words🙏🙏
This video is really helpful, thanks a lot
Thank you so much! I need this for my class report.
Excellent video!
Thank you so much Sir for this explanation.
You are welcome Mamoni Ahmed.
Awesome!!! Thank you so much
This is lovely
God bless you
Thanks for the kind words Princess Benson.
Thank you Dude, well done.
Appreciate your work..thank you
A huge amount of thanks 👍
Wow ....best teacher 🤗
Best explanation ever
They are perfect I don’t know what was I going to do without there video
Unbelievable!!!!I have understood clearly now
thanks.........well explained keep it up
Thanks bro
The explanation is just awesome 👍👍
Thanks you so much this really saves my time
Great vid! Thank you
Thank you helped me understand so much better
Thank you for making physiology easy 🔥🔥🙏🏻🙏🏻😩😩
Well explained. Thank you
Thank you so much when my doctor give it i didnt understand it now i think i understand it
well explained...thank you
Perfect. I commend you
You deserve a place in heaven, may god bless with health, wealth and all the happiness 😘😘.