Surface Tension & Role of Surfactant

Surface Tension & Role of Surfactant
Like this video?
Sign up now on our website at www.DrNajeebLectures.com to access 800+ Exclusive videos on Basic Medical Sciences & Clinical Medicine. These are premium videos (NOT FROM KZbin). All these videos come with English subtitles & download options. Sign up now! Get Lifetime Access for a one-time payment of $45 ONLY!
Sign up now on our website at members.drnajeeblectures.com/
---------------------------------------------------------------------------------------------------------------------------
Why sign up for premium membership? Here's why!
Membership Features for premium website members.
1. More than 800+ Medical Lectures.
2. Basic Medical Sciences & Clinical Medicine.
3. Mobile-friendly interface with android and iOS apps.
4. English subtitles and new videos every week.
5. Download option for offline video playback.
6. Fanatic customer support and that's 24/7.
7. Fast video playback option to learn faster.
8. Trusted by over 2M+ students in 190 countries.
---------------------------------------------------------------------------------------------------------------------------
▬▬▬▬▬▬▬▬▬▬ Contents of this video ▬▬▬▬▬▬▬▬▬▬
Surface tension is the tendency of liquid surfaces at rest to shrink into the minimum surface area possible. Surface tension is what allows objects with a higher density than water such as razor blades and insects (e.g. water striders) to float on a water surface without becoming even partly submerged.
At liquid-air interfaces, surface tension results from the greater attraction of liquid molecules to each other (due to cohesion) than to the molecules in the air (due to adhesion).
There are two primary mechanisms in play. One is an inward force on the surface molecules causing the liquid to contract. Second is a tangential force parallel to the surface of the liquid.[3] This tangential force is generally referred to as the surface tension. The net effect is the liquid behaves as if its surface were covered with a stretched elastic membrane. But this analogy must not be taken too far as the tension in an elastic membrane is dependent on the amount of deformation of the membrane while surface tension is an inherent property of the liquid-air or liquid-vapour interface.
Because of the relatively high attraction of water molecules to each other through a web of hydrogen bonds, water has a higher surface tension (72.8 millinewtons (mN) per meter at 20 °C) than most other liquids. Surface tension is an important factor in the phenomenon of capillarity.
Surface tension has the dimension of force per unit length, or of energy per unit area. The two are equivalent, but when referring to energy per unit of area, it is common to use the term surface energy, which is a more general term in the sense that it applies also to solids.
In materials science, surface tension is used for either surface stress or surface energy.
Function. The main functions of surfactant are as follows: (1) lowering surface tension at the air-liquid interface and thus preventing alveolar collapse at end-expiration, (2) interacting with and subsequent killing of pathogens or preventing their dissemination, and (3) modulating immune responses.
---------------------------------------------------------------------------------------------------------------------------
Join this channel to get access to the perks:
Sign up now on our website at members.drnajeeblectures.com/
Follow us on Facebook:- / drnajeeb
Follow us on Instagram:- / drnajeeblectures

[@khanamhalima7400]

OMG... I've been searching for your video on this topic since many months.. I had to see many videos .. Thnku for this but I have only five days in my exams.. Try to see it before exams in sha Allah.. I often think when I'll write my thesis I would firstly write your name... Thanks to Dr Najeeb and after that I would mention anyone else in sha Allah 🥰🥰🥰🥰🥰🥰

[@DoctorNajeeb]

Thank you for your love and support. :) May you be blessed with knowledge, prosperity, love and happiness, always.

[@explorer6132]

How can someone explain these typical things so easily Sir we mean with all our heart sir u r our god .🙏🏻 With tears of joy. Love u a lot sir All my respect to you ⚕️🙏🏻 Expressing emotions after watching a lot of your videos from months .

[@jayprakashsingh5605]

Such kind of concept i have never seen in this universe i m great fan of u thanks for your support

[@DoctorNajeeb]

That’s so nice of you. Students like you keep me going. More power to you. ❤️🔥

[@manansuri8716]

Sir!! Hats off!! I am so benefited by these lectures thats words cant suffice to express.. Thank you so much for all the contribution you are making towards medical fraternity and serving the humankind

[@AK-yu4tf]

Amazing video sir thank u very much sir great help for medicos 👍👍🙏🙏

[@Anononymous.d]

Thank you so much sir. I was reading this topic from book and I was really frustrated because I was not able to clear it's concept. But I saw your lecture and it's fantastic. I've been clearned with concept of Surfactant. Thank you so much sir 💕

[@komatireddypranavireddy7114]

Thank you so much sir...enjoying physiology concepts.. only and only because of you..😇😇🤩 Big fan of your teaching style❤❤

[@DoctorNajeeb]

Thank you for your love and support. :) May you be blessed with knowledge, prosperity, love and happiness, always.

[@saras5826]

Superior!! Your teaching skills are out of this planet. Thank you

[@DoctorNajeeb]

Glad you think so! Keep supporting ❤️

[@herbertaugustino-px3wc]

You are so conceptual. Dr najeeb

[@kendraabdullahi]

What a genius!

[@kennedymwila3788]

What a teacher, thankyou very much Dr. Najeeb.

[@DoctorNajeeb]

Appreciate that a lot. Stay tuned ❤️

[@meronhailu2020]

Thank you Dr. Najeeb for your informative lectures they were part of my med life since undergraduate class till now 🙏🙏🙏

[@DoctorNajeeb]

All the best. Happy learning ❤️

[@snowythegreat9677]

Love you so much sir! You're truly the best. Your videos are the only reason physiology is proving interesting to me.🖤

[@DoctorNajeeb]

Happy to hear that! Thank you for the kind words ❤️

[@hemangiiiparmar5244]

Thank you so much sir 😊

[@anirvana4386]

A unique one god bless u

[@ushakhan8423]

Thank you Sir. Got my concept crystal clear from this class. Respect and best wishes for you.

[@DoctorNajeeb]

We're counting our blessings. Thank you ❤️❤️❤️

[@learnwithme1652]

An extraordinary lecture about surfactant...you really deserve to be to much appreciated.....👏👏👏thank you soo much...🌸

[@DoctorNajeeb]

Thank you for your kind words❤️ Keep supporting❤️

[@mohancharanmurmu623]

Excellent lecture...

[@Proxima123]

Literally, one of the best teachers ive ever come across... Your lectures are evergreen sir ❤

[@DoctorNajeeb]

Glad to hear that♥️ Stay blessed ♥️

[@senelidesilva6193]

Thankyou so much Doctor...You are our saviour😍

[@DoctorNajeeb]

That’s so nice of you. Students like you keep me going. More power to you. ❤️🔥

[@abdulnasir655]

Thank you soo much sir you are very helpul I'm fsc student but were having confusions about surfactants I solve all about them after watching this video Love you sir from peshawer

[@DoctorNajeeb]

Glad to hear that ❤️ Keep supporting❤️

[@marah99611]

The most perfect lecture with most perfect doctor ❤❤❤❤

[@DoctorNajeeb]

Glad to hear that. Stay blessed ❤️

[@ishwaryaperumal4459]

Thank you so much sir 🙏... I was struggling with this topic now iam clear... Great work sir.. Keep on doing 😍

[@DoctorNajeeb]

Glad you found my lectures to be meaningful and easy to understand. Stay blessed and stay tuned ❤️

[@Gopukrishnan2212]

Thankyou very much sir.. By uploading your this type concept clearing videos here, every medical student is getting benifit, even the students who dont have money to buy video lectures... Thanku very much..😊

[@DoctorNajeeb]

Thank you for sharing your valuable feedback! ❤️ Stay tuned ❤️

[@tanishrana228]

Thank you so much❤ sir..... Ur videos are really very helpful and knowledgeable 🙏......

[@DoctorNajeeb]

Thank you for your love and support. May you be blessed with the knowledge prosperity and happiness always. Keep supporting.

[@rafiabasheer8845]

thnkx...very nice😍

[@noneed4693]

You helped me alot i don't kow how to thank you may god bless you🙏

[@DoctorNajeeb]

Glad it helped you. Happy learning ❤️❤️❤️

[@venkateswarluvallabhapurap3868]

Basically iam a Physiologist after listening your videos my interest towards subject increasing sir. Really your amazing sir

[@DoctorNajeeb]

Thank you for all the love and support❤️ Stay blessed ❤️

[@yashlachhwani5687]

You are way too good sir

[@DoctorNajeeb]

Thank you for your love and support. :) May you be blessed with knowledge, prosperity, love and happiness, always.

[@anirvana4386]

You are The Best teacher in the universe

[@DoctorNajeeb]

Thank you for your kind words❤️ Keep supporting ❤️

[@rosaceae6748]

Awesome lecture sir. love from India 🇮🇳

[@DoctorNajeeb]

Love you more 💟

[@immaimma5317]

Thank u dr.najeeb

[@DoctorNajeeb]

Thank you for your love and support. :) May you be blessed with knowledge, prosperity, love and happiness, always.

[@drsaad3477]

Sir g You’re Great MasahAllah ✨🇵🇰 More than 8 hours Daily I’m just watching Your Lectures Thanks Sir ❤️

[@DoctorNajeeb]

Jazakallah Khairan! ❤️

[@muhammadyousaf7143]

great sir g

[@917hshzuan2]

Thank you very much sir

[@DoctorNajeeb]

You are most welcome :)

[@matetimanisha136]

Thank u very much sir....

[@DoctorNajeeb]

You are welcome. Keep sharing your feedback. Stay blessed.

[@55fareenasadia93]

Thanks alott sirr

[@DoctorNajeeb]

You are welcome💖

[@shrutipathak2096]

Thanku so much sir 🙏😊

[@DoctorNajeeb]

Your most welcome! ❤️

[@vivekmishra1167]

You are a super teacher sir 👍🏽🙏🙏

[@DoctorNajeeb]

Thank you ❤

[@tanzeelamaqsood7721]

Excellent explained 🥰🥰🥰

[@DoctorNajeeb]

Thank you ❤️

[@frz3908]

Sir! Thank you 🙏🏻

[@DoctorNajeeb]

Most welcome!❤️

[@user-mi1zb7cq4y]

Excellent lectureing❤

[@DoctorNajeeb]

Glad you liked it

[@creater44]

Thank you sir 😊

[@DoctorNajeeb]

Most welcome💕

[@elsabetgelan4877]

❤❤❤❤❤❤ Please Caption ON(subtitle)

[@mianaman2842]

Love you sir

[@DoctorNajeeb]

Love you more dear❤

[@hemakantarohidas7478]

Superb sir 👌

[@DoctorNajeeb]

Thanks 🙏

[@nabiahmad4475]

Good

[@DoctorNajeeb]

Thank you💝

[@shwetakanwar8194]

👍👍

[@Nifazkhan799]

Sir ❤️❤️❤️❤️❤️❤️❤️

[@DoctorNajeeb]

Thank you so much for your love and support! ❤️

[@lukkaraghavendrarao7933]

super super super sir

[@DoctorNajeeb]

Thank you so much for admiring my efforts 💗💓

[@ajaynimbalkar8952]

👍

[@explorer6132]

❤🙏🏻

[@anuragverma746]

❤❤❤❤❤❤

[@DoctorNajeeb]

♥️♥️♥️♥️♥️♥️♥️

[@aasemahsan]

Surface tension Collapsing pressure (P=2T/r) If two alveoli have same surface tension but different size, smaller alveolus empties into the larger one *Perfusion-Ventilation ratio gets disturbed* 28:49 How Surfactant reduces surface tension Surfactant helps in defence as well because Apo-protein A & D are opsonins and it also has igA Surfactant - increases compliance of lungs -prevents pulmonary edema -equalizes ventilation in adjacent alveoli