Special Senses | Photoreceptors

Special Senses | Photoreceptors | Rods and Cones

Рет қаралды 241,127

7 жыл бұрын

Official Ninja Nerd Website: ninjanerd.org
Ninja Nerds!
During this lecture Professor Zach Murphy will be teaching you about the mechanism of photoreceptors. We go into great detail on the rods and cones, and how they respond differently to various types of light. Finally, we discuss how we adapt from a light to dark environment, to a dark to light environment, and how these photoreceptors respond. We hope you enjoy this lecture and be sure to support us below!
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Пікірлер: 179

@noraelmetwally8683 5 жыл бұрын

This channel fell from heaven 💙💙

@Light-qn4zh 5 жыл бұрын

Really I’m so happy because we live in same time ♥️

@himanshuambilkar4160 3 жыл бұрын

Photoreceptors- Rods- Rhodopsin Retinal sensitivity Scotopic vision. Cones- Photospin Visual acuity Colour Vision. Dark to light adaptation- Pupil constrict Bleaching pigment Rods turns off Retinal sensitivity decrease Cones turns on Colour Vision 5-10 minutes. Light to dark adaptation- Pupil dilation Rhodopsin start accumulating Retinal sensitivity increase Rods turn on Low wavelength not activate cones 20-30 minutes. Colour blindness Nyctalopia Night blindnesses Retinitis pigmentosum. Thank you sir

@donadona5698 2 жыл бұрын

👍

@felixd9849 2 жыл бұрын

'Low wavelength not activate cones', this statment is false. In the Video he corrects himself by saying the ligtht low intensity diactivates the cones. The rods have a much higher light sesitivity but the blue cones have a Adsorption Maxima at 420nm while the Rhodopsin is at 500nm. In Average while the Switching from Photopic to scotopic vision the spectral sensitivity shifts fom green to bluegreen also called Purkinje-effect/shift. So blue things appears to be brighter than red stuff.

@AstridDarinka 3 жыл бұрын

Now these are the type of people that are meant to do this job!! Thank you so much, taught me so much more than my university professor ❤️

@bushraaqeel5664 3 жыл бұрын

You are my real Professor!!!for all of my med school.i m glad i found this channel in my first year ❤

@jennafairhaven9084 4 жыл бұрын

Wish I had found you at the beginning of this semester.

@ELFCloudGamer 5 жыл бұрын

I have to tell you I have spent the whole day watching your videos haha, can't believe I only discovered them today

@johnnywalkervip1 4 жыл бұрын

Wow thank you so much, this video helped me get a better idea what my professor was explaining in class. ✔✔👍

@kumargauravsingh6683 3 жыл бұрын

What would I have done without you man ? You're simply awesome.🙏

@albeezhuang5 4 жыл бұрын

I love it. Excellent drawing and explanation. It draws all the points together that helps me understand the whole process. Very good job!

@tiffanymyat6320 Жыл бұрын

Thank you very much!!!!! It is truly amazing that you can condense all these information in this one video!

@kavitakar719 3 жыл бұрын

Excellent. Your grasp on the subject and teaching is just fab.

@its.morrissey_xx1179 Жыл бұрын

Im a first year optom student and this was so helpful in prep for my exam! Thank you! My a level biology teacher reccomended your channel and its amazing I can still find videos here not only covering a level but university content too!

@AmalieKandel Жыл бұрын

Thank you for another amazing video breaking down these complicated things in an understandable and organized way! Love the drawings as well - very helpful :))

@davidaminov7930 4 жыл бұрын

"Oh man you know what? spiderman movie was so great! I wanna go back in again, and watch it again" 15:48 LMAOOOOOOO #Visual_adaptation Zach you are the B-E-S-T!

@user-dq9sd1wd1p Жыл бұрын

Finally made sense of my notes my lecturer gave .This is awesome

@ruthannfacey7586 3 жыл бұрын

This man is amazing. Always a pleasure watching your videos !!!!!!!

@hamdiscorner5286 3 жыл бұрын

I never understood why pupils constrict in bright light before this video. Thanks Zack, stay blessed and continue helping doctors around the world 😍

@yannaaguilar7367 4 жыл бұрын

U teach more than my professors do

@abazaabdelmageid774 3 жыл бұрын

You're more than perfect 👌. Thanks for your excellent and brilliant explanation 👏

@solwane 3 жыл бұрын

if only i found out about this channel since year 1 med school wasted 6 years now graduated and this helps review for usmle exam, thank you brilliant doc and teacher

@salahaldinfarhat5691 3 жыл бұрын

Thank you as always for this amazing work of art !

@hamedhosseini4938 5 жыл бұрын

Thank you so much Zach.

@mysticalpotato86 13 күн бұрын

This is gold. Thank you so much.

@hiramuazzam8490 5 жыл бұрын

The best lectures are of ninja nerd

@dorothybonsu8468 2 жыл бұрын

BROOOOOOOOOOOO!!!!!!!!! This video was the best video in explaining this process. Thank you sooooo much for making it!!!!!!!!!!!!!

@l.kozasdiary7958 2 ай бұрын

I agree!!

@mahfa7513 4 жыл бұрын

Thanks for your time to make this video great

@emiledyanne 4 жыл бұрын

You are truly blessed! Thank you!

@poosmi Жыл бұрын

you're actually clutch for this one

@medico755 3 жыл бұрын

Seriously a best lecture ❤️🙏

@user-cd6mc5fz2g Жыл бұрын

stay blessed ninja nerd , love you so much and you are the best .❣

@galbehar 3 жыл бұрын

your videos are amazing! helped me understand so well thank you:)

@pillowwall2283 3 жыл бұрын

FAVOURITE CHANNEL THANKYOU HOPE YOU LIVE A BEAUTIFUL LIFE 💜

@andisporepmathias.3717 Жыл бұрын

I love all of his Explaination.

@yoshana2340 4 жыл бұрын

Amazing and informative video

@Ajaybarath 2 жыл бұрын

Ultimate explanation sir 🔥🔥

@nabodimma 4 жыл бұрын

THANK YOU SO MUCH!!! Thank youuuuuuu.

@shreyaray5500 4 жыл бұрын

You're the best teacher ever!

@j.sbhandari8813 4 жыл бұрын

15.55 the happiness I saw on your face was so touching u make me laugh and enjoy my med study tho if it's hard

@Zdnew 2 ай бұрын

Amazing ❤ thanks a lot ! 🙌🏻🙌🏻

@zanejansone-langina5943 4 жыл бұрын

I have specialization exam for my PhD and I have this ticket - you saved my grade :D

@abushabbab5018 10 ай бұрын

I love this man

@naikamal8175 4 жыл бұрын

Terrific and glorious ninja

@meerafathima4479 6 жыл бұрын

superb awesome sir

@atiqanabilah1576 5 жыл бұрын

Thank you so much!!! 😭😭

@Emilio77able 3 жыл бұрын

Amazing!

@ameenoahmad 8 ай бұрын

Awesome video

@abdiwelimohamedali3164 3 жыл бұрын

Best chenell so far

@ashutoshjadhav7224 5 жыл бұрын

u r best , thanks sir

@lisagigi2893 3 жыл бұрын

Wow! you are so so great! Thanks a lot!!!

@nargisjumahan1137 4 жыл бұрын

You are awesome Ninja Nerd

@ibtihelra3515 3 жыл бұрын

thank you soooooooo much Zach

@muhammednishan4807 4 жыл бұрын

Such a great lecture mahn😍

@NarpatSingh-ze2lv 5 жыл бұрын

Very helpful ☺️ tysm

@vivek.sasane Ай бұрын

Thank you so much sir ❤

@aanyagupta4245 5 жыл бұрын

Huge fan of ur sir😊

@afnan5470 5 жыл бұрын

you make everything make sense

@hadinoori2718 3 жыл бұрын

Thank you sir such a nice clear lecture and one of my favorit lecturer love from afghanistan

@umarsiddiqui6488 3 жыл бұрын

dude is a LIFESAVER!!!!!!

@sewaralqubailat1904 2 жыл бұрын

You are a gift ❤️❤️❤️

@louiskhoo3507 5 жыл бұрын

very good video!!

@mainakbarai219 3 жыл бұрын

Really helpful

@mustafaeye7081 4 жыл бұрын

Great, thanks so much

@vakskas2866 2 жыл бұрын

Great baby ,, I really appreciate this hard work ...,

@terziuterziu5964 5 жыл бұрын

Amazing 🤩

@happychappyrose 4 жыл бұрын

When you said the rods have low wavelengths as dark light did you mean they have a lack of wavelengths?

@aimenshelly2986 3 жыл бұрын

Thank you so much.

@learn4307 2 жыл бұрын

Thanks sir....u r the best❤️

@georgejeraldbanda2101 2 жыл бұрын

THANK YOU

@godofallgodswithnoothernam920 Жыл бұрын

Excellent

@AkashKumar-gn6sh 5 жыл бұрын

Thanks sir, sir I want study about ERG, so please suggest video..

@razansalman9215 5 жыл бұрын

thank you so much you are amazing

@abeikukimani8565 3 жыл бұрын

you're a life saver

@ashleyd.5589 3 жыл бұрын

thank you!!

@kmb85045 3 жыл бұрын

the best teacher

@LHost-sx2kk 6 жыл бұрын

I know you said that the phototransduction for rods and cones is really similar on the phototransduction cascade video, but how does the high amount of light doesn't cause the dissociation of the transducin on cones? Is that why you said the "less sensitive cones turn on"? so more sensitive cones would be turning on as adaptation to bright light occurs?

@noraelmetwally8683 5 жыл бұрын

From what i know , There are about 120 million rods receptor , on each one there are plenty of escotopsin ( rhodopsin ) but these receptors have low threshold ( which means a high sensetivity to light photons ; that's why they can feel the less light in the dark after the adaptation But on the other hand, we have cones which are hugily less in number compared to rods (only 7 millions mainly exist in fovea centralis or macula lutae ) but they have a highly threshold value so they do just work on highly amounts of photons So in day light the rhodopsin is massivly destructed Which means that the rate of its destruction exceeds the rate of its synthesis in liver and retina On the other hand , theoritically only 1 million of the cones respond to the light But at the end The both cascades are the same but it only differs according to the sensetivity of the receptor ( i hope i explained it )

@amyleepurton 2 жыл бұрын

💛 thank you

@a30s 4 жыл бұрын

nice explanation

@sharungarg2850 2 жыл бұрын

sir, why does rhodopsin accumulation takes time ? as you have said that after dark to light shift rode cells become inactivate so during light I feel rod cells get enough time to prepare themselves for dark light.

@suhaskumar7018 3 жыл бұрын

Thanks a lot ❤️

@masikasauda7673 Жыл бұрын

Thank you sir

@zaidkhan-yc3fd 2 жыл бұрын

nice lecture 👍

@Shazib8 2 ай бұрын

Nice!!

@LauraPerez-do9mv 9 ай бұрын

Thank you!!!!!

@assyfaatha665 2 жыл бұрын

thank you for helping me pass the exam, sir Q_Q

@user-xc5eb2ih2z 21 күн бұрын

Thank you

@dariocosemans8326 2 жыл бұрын

Legend!

@donadona5698 2 жыл бұрын

You’re unbelievable!!!

@MrBlazingup420 4 жыл бұрын

Have you ever heard of the McCollough effect The McCollough effect is a phenomenon of human visual perception in which colorless gratings appear colored contingent on the orientation of the gratings. It is an aftereffect requiring a period of induction to produce it

@Hasson-nd4xx 4 жыл бұрын

thank you i am in ophthalmology residency, but no one help me to understand basic as you

@rimpimalakar2422 Жыл бұрын

Zack paaji tussii great ho ji .❤❤

@lawrenceyelkin6839 4 жыл бұрын

Awesome. Do you have a source you use for your knowledge? Textbook? Neuroscience book? Some books get really detailed like Guyton and Hall. Wondering where you find your information.

@akshatgupta2687 3 жыл бұрын

He uses BORON and the likes. A personal suggestion-: Try to read GANONG which is a review book of physiology and make notes. You will find some concepts explained in a breath-taking way. Though your comment is 1 year old I doubt my suggestion would be of any help or not.

@prashant4702 4 жыл бұрын

Thank u so much😍

@rashmisingh3512 5 жыл бұрын

You’re so Amazinggggggggggggggg

@charlesevelyn6563 3 жыл бұрын

thank you so so so so so so so much

@nara9793 2 жыл бұрын

thank you! :)

@oop8599 3 жыл бұрын

THANKYOU VERY MUCHIEEE

@the_accidental_doctor Жыл бұрын

Ohhh man you are genius ❤️

@kinleyyoezer8353 Жыл бұрын

Tysm sensei

@tasneemtaherali2893 Жыл бұрын

I have a question : From the video of photo transduction cascade, you mentioned rhodopsin getting activated by light. So if the pupils constrict in bright light to focus the light on the fovea, then how do rods "turn off"? I hope the question makes sense

@sambitmukherjee8480 Жыл бұрын

This is because due to the continuous activity of light on rhodopsin it is getting continuosly broken down into all trans retinal and opsin. So not much rhodopsin is now left and that is why rods are getting turned off. Hope you understood. Please let me know