Surface Tension and Surfactant (Fluid Mechanics - Lesson 12)
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A discussion of surface tension, with emphasis on the role surfactant has in reducing surface tension within the lungs, and the consequence this has for respiratory mechanics.
I appreciate this video. Surfactant and its effects do not come easily to me, even after reading my text, but you really cleared it up for me. Thank you.
ezziee.
Excellent video. I'm a Physiology instructor, and I'm going to teach Respiratory Physiology to medical students in Venezuela, your lecture has been really helpful. Thanks!
gabrielbve
@Utkarsh balani (sorry, unable to directly reply to your comment), I am unaware of any clinically relevant, direct effect by which surfactant helps to prevent pulm edema. Indirectly, as surfactant prevents atelectasis (i.e. alveolar collapse), it theoretically helps to prevent the development of pneumonia, which would result in focal pulm edema. Pulmonary edema, on the other hand, directly reduces surfactant content, most likely due to proteolytic enzymes in the edema fluid breaking down the surfactant, but a mechanical "washing out" of the surfactant by the edema fluid may also play a role.
StrongMed
I couldn't uderstand those terms about several months until I watched this video. Appreciate it!
vokimanh_
Thank you for this playlist. This was tremendously helpful in my preparation for the MCAT. You rock! God bless you
emonperl
Great video, very helpful. I just started school in Respiratory so i can use videos like this to help me learn. Thank you for this and I plan to keep watching your channel and learn more.
eliassiraj
Thank you so much. This has made my understanding of surfactants in the lungs as clear as day. I'm a student in an Anatomy and Physiology class and this is exactly what I needed.
jpmillard
Thank you so much for this video!! I have been struggling for a long time to understand the concept of surface tension and lung mechanics in general, and this video has been extremely helpful and delivered exactly what I needed.
Youstina.bassam
fluid mechanics was so tough and confusing when taught in class but you make so simple and easy....thank you
renethomas
If my professors teach like you, I will have no problem understanding their lectures!! thanks!
eason
I was not understanding surfactant since my medical student days, today I was able to know basics, really thankful for ur explanation
madhukardeshpande
@Strong Medicine, Why is the water / surfactant mixture inversely proportional to surface area?
Mohamed-thox
Dear Eric though I am engineer by profession I thoroughly enjoyed your presentations especially the examples of our human body related systems
sureshsrinivasan
Mikko Haavisto I'd love to discuss quantum mechanics in medicine, but unfortunately (at least in 2014) there wouldn't be much to discuss.
StrongMed
I FINALLY understood this for my physiology I exam. Thank you so much this was explained clearly and succinctly with great visuals
paulinamorel
I'm looking for a video on the mechanism by which surfactant reduces surface tension. Is it by increasing entropy? Cathrage cages? or some other mechanism?
MikeBirkhead
Why is the surface tension of the mixture of h20 and surfactant proportional to the surface area?? And not so with the water alone? Is this answered y the article you cite in the description of the video?
Thanks
juanbacisneros
I still don't understand what exactly water does to the internal surface of the alveoli, in the case no surfactant is present. This fluid (containing water) is only coated on the internal surface of the alveoli. It "contracts" in the alveoli, and this somehow reduces the radius of the whole alveoli? How? Why?
zaidmousa
Absolutely fantastic video. I really enjoy the format of this video, with the relevant demonstrations of the concept and the familiar parallels drawn. Awesome stuff. Subscribing now, hope to see more videos like this. Thank you!
InaamHD
Great lecture. I saw that water is coating the inner surface of the alveolus. You mentioned that the surface tension of water coated is independent of the volume of the alveolus because surface tension is intrinsic. But I think if the alveolus has bigger volume, it might have wider inner surface and therefore more water molecules are able to stick which makes higher surface tension because there are more water molecules...? I want to know whether this is true or not
