Cell membrane introduction | Cells | MCAT | Khan Academy
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- Опубліковано 21 сер 2024
- Learn about how phospholipids form the cell membrane, and what types of molecules can passively diffuse through the membrane. By William Tsai. Created by William Tsai.
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You deserve the money I'm giving to my college. Learned more from this video than I do from my current professor.
Isn't this grade 12 biology?
Real Deal Holyfield I learnt this in 9th grade and am learning this back in college...
@@adityarajasekar5138 dude im currently in 9th grade and now learning this for an upcoming test😂
@@iasonpetridis5612 i am studying the that is tomorrow
@@typicalcarchannel5990 ummmm I'm not even joking my test is tomorrow as well...
The key point at 3:50 is that *the water is also hydrophilic*. Water likes to touch other water (water molecules are attracted to each other but not attracted to fatty tails). This is the main reason why the water would prefer to escape from inside the layer.
Even our teacher says, "if you need more help you can check Khan Academy".
Way to judge. -___-
"Like a Balloon but with two strings..."
Not me.
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@@hadiputra2871 i found you on different comment
Instead of saying that it's semi-permeable, the proper term that should be used is that it is selectively permeable. Otherwise it's a great video!
+Ian Song yeah i was thinking the same or it could be partially permeable.
Ian Song Those terms are synonymous
finally I was trying to remember the other name for it, thanx
@JoeBorealis actually, they aren’t, semi means half, so by saying that it’s semi permeable would mean that half of the substances _can_ permeate it, which isn’t true. Selectively permeable would mean that only a few selected substances can permeate it, meaning those that are small and polar.
1990s "science" **We don't have complete knowledge. 2010s Science: Don't give it to those bigots: we have the facts! 2030s: our science has always been as good as the money our politicians give us.
Never have I ever wondered that
Me : Didn't give any attention in my biology class.
Also me: Giving all my attention into this classes.
Hello
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This was the most helpful cell membrane source i have found yet!!!! I just subbed too :)
Hey Damien.
Hi
Damien Steward OMG that's PRECISELY how I feel. This video just summed it up all so well🖑
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My teacher has a really strong accent so I can't understand her as well, but this video cleared everything up 100%. Thanks so much!
We have this teacher who is Brazilian and we can't always understand her so I feel you bro lol
The reason we all always understand the studies on our phone is because of we're actually tricking our brain that it's just like an entertaining medias and enjoyable apps, that way our brain we'll get interested on whatever we're seeing on the phone.
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Thanks a lot for this video and it really helped me understand a cell membrane better than my teacher teaches me.
Videos uploaded by Khan Academy are always useful...☺☺
Thank you for explaining this subject so clearly, very helpful to me!
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thank you for english subtitle .
This video helps me to understand the cell membrane easily than my own teacher explaination. Thanks a lot.
This helped me to clear my concept
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Learning it in 7...
Very nice , please check the video from -2:55-3:05 , there will be hydrophilic..you said hydrophobic head
This was so helpful! Cleared up everything my teacher tried to teach. Thx
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Thanks
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Thank you
What are polar molecules??? Please reply.
A polar molecule has two oppositely charged poles. A molecule is made up of different atoms and some atoms keep their electrons better to themselves than others. Therefore one part of the molecule can have more electrons than the other part. That's called polarity. But remember, the molecule as a whole is still neutral.
Really well told
Thank you ;)
Nice
I like ur acent
Awesome
i would like to know how atoms bond together to make membranes.
Wish you was my biology teacher! Very clear easy to understand. Thank you.
I live in Europe and we're doing this in freshman year
@khanacademymedicine please don't remove your MCAT materials next year :'(
What happens to the membrane potential if you increase sodium permeability?
I don't think I have ever known enough about cells to wonder why they don't fill up with water whenever I shower or go swimming. I mean seriously is that a thing, who wonders about that?
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how does O2 and CO2 pass through cell membrane . as you said they are non polar and it can pass through fatty acid easily but before it reach fatty acid it has to cross the phosphate head . so i don't understand how non polar molecule cross the phosphate head . plz answer @all
and thanks a lot for making such great videos @khan academy
Because they are very small molecules..they manage to "sneak" in
Fatty acids don’t like water, besides the Oxygen and carbon dioxide being small, they don’t contain hydrogen so the fatty acids let it pass through easily
What about protein channels ? Which glucose can pass through
1:24
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So, are you in?
A bit too fast for my taste but otherwise really good and concrete.
is there a transcript for this video?
The only thing I want to know is how aquaporins are not active transport.
why does the phospholipid bilayer only allow non-polar molecules to pass through? I understand its because it's hydrophobic...but how does that link to it being able to diffuse quickly???
Non-polar molecules are not truly "hydrophobic" they are just ignored by water and everyone else. All of it arises because water is attracted to other water. Imagine a bunch of small magnets (polar) floating in oil (non-polar). Oil isn't "afraid" of magnets and magnets don't repel oil. It is just that magnets want to be near other magnets. Magnets (polar) will attract each other and form a layer while oil (non-polar) will still be able to pass through the gaps between them.
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I'm here coz our teacher is just reading the slides instead of explaining it
😊
very helpful bro
Isn't it supposed to be selectively permeable? Idk
I thought glucose could pass through the dialysis tubing?
2:39 the thing looks like a Jellyfish XD XD XD XD XD XD XD
Hi
He said hydrophobic head you meant hydrophilic
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If ethanol can pass very slowly through the cell membrane, does it mean that you can get drunk after lying your arm into alcohol for a while?
There are reported cases of ethanol poisoning in children who were wrapped in sheets soaked in alcohol. Some people use this method as home remedy to lower the body temperature. (don't do it) But children's skin is more permeable compared to adults' skin.
So, maybe you wouldn't get drunk after lying only your arm in alcohol. Maybe if you took a bath in alcohol... 🤔