I have never seen such a good teacher in my life! I highly appreciate the hard work put, by the whole team, into making these videos. I literally recommend this channel to every student I see. Keep up the amazing work Ninja Nerd.
Such a genius! I am fasting with no sleep but still focused and attracted and paying attention and that’s just because of your marvelous explanation. God bless you
I am watching you from the UK and think you are an amazing teacher. So wish I had you teaching me when I was back in school. I can see the passion you have for teaching. Keep up the fabulous work.
I am literally going back through every video Ive seen and making sure to like and comment. I want this channel to be viewed and help as many as it can. #NN4LIFE
why can't our professors teach us that way????? I can't believe I pay for my college to get back home and watch a great person life you teaching for free. life Is unfair, but thank you thank you from the bottom of my heart!!!!!!
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Props!!! These are great videos. Confession: I put you on double time for all you lectures and I really like that you use the white board to both draw and write the concepts you talk about. I mean, obviously, if I'm on RU-vid watching lectures, then I'm a visual learner by nature and most likely have a shorter than average attention span. On double time, your lectures are a little over 20 min soit perfect for me. I don't find myself getting distracted waiting for you get to your next point (or to finish drawing 25 water molecules 😁 ) So thanks for providing content for learners like me and keep up the great work. These videos are a fantastic way to refresh and review these essential building block topics of Anatomy and Physiology.
I have a question: If the watermolecules exert a force downwards (or to the edge of the alveoli, towards the outside), then why does it cause the alveoli to collapse? To me, it would make a lot more sense that the alveoli would collapse if there was a force towards the inside of the alveoli instead of the outside... Please excuse the forming of this question, English is not my first language :o
I don't know about that "downward force " thing(I myself didn't get that actually) but just to make an understanding I've seen it as since the air liquid interface molecules are experiencing force due to surface tension they tend to decrease the number of surface molecules and hence tend to reduce the surface area which makes the alveoli collapse towards the centre....hope this makes some sense...
Think about the free body diagram of alveoli at the top the top most layer is getting pulled downwards so the rest of water is pulled up wards 3 rd law of Newton as the bulk water is pulled upwards by top layer the also pull the alveoli upwards or towards the center
I would really express my sincerely feelings toward your great helful video , I haven't seen ever such a great video like that , please keep on the good useful work . Thank you so much.
you're litterally saving my first year med school exam and I'm so grateful for it ! i'm watching you from France and you explain waaay better than my actual teachers ! keep on going
Incredibly well explained, it's good to see someone so passionate and naturally engaging in what they're teaching. May you never be bored a day in your life sir, well done!
hey man i learning about fetal lung maturity and i was so confused because the textbooks would toss around terms without explaining the mechanism of surfactant, only that it "decreased inner alveolar surface tension". ive gone through my previous textbooks and other websites but your video really shone the spotlight on every single aspect needed to fully understand surfactant and inner alveolar surface tension. massive respect and thanks, keep up the great work.
21:00 does anyone know why the alveolar pores help maintain the alveolar structure rather than act as another tube where air can flow from the smaller alveolus to the larger one? Sorry I'm stupid, but it doesn't make sense to me right away.
It's because of the air and water interaction..since the water is causing the surface tension of the alveoli to increase by going deeper..the alveoli collapses so that the air leaves and the tension decreases and the alveoli is not under tension..hope you got it
@Cocolhasa In short, there is a force exerted towards the centre of the alveolus by the water due to its desire to maintain a low surface area. The water covering the inner lining of the alveolus tries to assume the least surface area possible by cohering with one another. This is due to the fact that water is a polar molecule and can form hydrogen bonds with each other, and the ideal scenario for the water is to get into its lowest energy state. When you inhale, you are pumping more air into the alveoli. To get the alveolus to expand, the water that is stuck to the lining of the alveolus also has to expand with it. This increases the surface area of the water, and the water doesn't want that. The water produces a force that exerts towards the centre of the alveolus, sort of like a water droplet trying to maintain its structure to achieve its lowest energy state. That is surface tension.
Hey I am really thankful to you for your these lectures!! Your videos are simply amazing nd way much much much much better than any other lectures we had in medical school !! You are doing a great job plus the way you teach with so deep understanding of subject nd topic is commendable !! I've seen many of your lectures nd trust me it has helped me like hell !! P.S. The ratio of understanding the topic from your videos to from books nd by self study is 60:40 ! I really appreciate !
11:32, He is Pierre Simon La Place, a person who contributed a lot in world of physics. Sometimes my Prof. doesn't want me to include the concepts in physics in physiology but I think it is right to utilize those formulas
THANKS ALOOOOT,that was really helpful.* A small suggestion: can u at the end of the video picture the hole board in ones, so that how we can capture the screen -> revision and memorize it always .
I was so confused about how the surface tension works and how the surfactant decreases the surface tension. But this video explained all the concepts so perfectly that now I understood it. Thank you so much guys.
You are one of the best teachers I have ever seen! No exaggeration. Your videos are helping me understand the material we are learning in paramedic school. Please keep it up!
Sincerely u r a very gud teacher....U make things clear in such a gud way which are helping alot in my studies...I appreciate every video of yours ... u put alot of efforts to explain every detail of the topic...Please keep posting ...Thanks alot once again😊☺️💐🤗🤗 Can u please make a post of Dna Rna Replication , transcription .... And details about the Dental Anatomy for each teeth ... for better understanding....please 😊
Thank you very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very veryvery very very very very very veryvery very very very very very very you saved my life on my upcomming exam
I keep thinking: if there were a lot of hard working lecturers like you around the globe would be so great. You are of great help. I definitely have a folder of almost all your video series and I would keep liking your videos and and downloading. I don't even know how to thank you. But may God bless you and Crew for work well done. if i were to rate your videos it would be the world's best lecture videos ever with valuable, updated and reliable knowledge.😍
Amazing lecture!!! Absorbing it into the inner core of my brain🤣 Pls. Can u hve a lecture with regards to Mechanical Ventilation. Thanks for your dedication in imparting ur knowledge to ur viewers.God bless
Ho brah..nice vid yah..just looking up law of laplace for my rc program and what do i find? Da kine from maui reprazent!! Shootz..ty plenty so helpful lidat😉
I am working on a presentation for my physiology club in residency and I spent HOURS trying to understand the whole surface tension surfactant interaction, read 2 different physio book chapters, watched like 3 RU-vid videos but NO ONE explained it better than you! I am incredibly happy I stumbled into your channel :)
pathology resident from germany here who needs to revise some basic physiology :D just wanted to let you know your videos are helping all kind of people, you are a great teacher
Mannn, tried reading all this from the textbook and made ZERO sense. This video playlist makes is easy to understand. Shoutout to you! Recommending to my class fr fr
Juan B. Cisneros this is what i think it is : when air goes in the alveoli it interacts with that h20 molecules and because the water molecules don t want to interact (causes tension between them) they ' run away' like some kids run to their mom that is the wall of the alveoli .The alveoli thinks oh i know what s the problem we need to make that air go away so it doesnt create tension with my kids so it collapses and get s that air out.
Sarah Gloria I’ve been thinking about it... my guess is that it collapses when the air goes out of the alveoli. Because since air is not anymore in the alveolar space, then the water molecules can approach. Since they’re more close to each other, they form hydrogen bridges and then the alveoli collapses (because water is together). Here, surfactant would impede water molecules to get together when they’re are close at inspiration. Do you think that makes sense?
Juan B. Cisneros Your answer made me see what s wrong in what i said.When air enters the alveoli the surfactant helps us conserve energy since there are those strong hydrogen interactions makes them easier and let s the alveoli to expand.Secondly the the layer of water gets thinner and the tension created will push the alveoli which because of it s elasticity and because the air going out (because of it s gradient) would collapse if there wasn t surfactant that it this case will prevent those hydrogen interactions to be so strong and the alveoli collapses without collpsing( the walls won t stick to one another).i think this is what you said.
Sarah Gloria So could we conclude in that there are two reasons, right? The first being the fact that if the air leaves the alveoli, the water molecules will approach. The second, that the recoil generated by the first expansion, will make the alveoli colapse. In the second reason we could apply Laplace; P=(2xT)/r In some way, the recoiling works like in the heart, which is mainly explained by the Frank-Starling relationship.
So sorry but I have a question. Take for example during inspiration when the intrapulmomary pressure is high (+1mmhg), does the collapsing effect of surface tension hold significance even without surfactants? According to laplace, the tension of a wall = the pressure exerted by it's content × radius
Thank you for this VD I wanna do a point on that I heard the surfactant is completely formed after 28 weeks of gestation period but in this VD 24 weeks what is actually right?
@NinjaNerdLectures But shouldn't the water pushing on the alveoli walls cause it to expand? I mean, the water pushes the alveoli in outward direction everywhere? I can see why Surface tension causes the water layer to shrink, but i am not able to see how this co-relates to the alveoli itself shrinking?
Bro! Take love! I wish You get tons of money,healthiness, peace in your life! Thanks for helping this poor soul of medical school... Thanks...You are the best!!!💜
Hey i have a question..in your example ( at 24:04 of video) you said more air will go in the healthy alveoli n it will become hyperventilated and radius will increase so pressure will decrease . What about about the more amount of air creating more surface tension among water molecules? Force of repulsion increase and tension on the alveoli increase.. won't it increase the pressure? Please guide. Love your teaching skills Thanks in anticipation 🌸
