Special Senses | Photoreceptors | Rods and Cones

[@Light-qn4zh]

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

[@noraelmetwally8683]

This channel fell from heaven 💙💙

[@himanshuambilkar4160]

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]

👍

[@felixd9849]

'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]

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]

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

[@jennafairhaven9084]

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

[@yarom1342]

i really appericiate you making this informative video. one of if not the best one i've ever seen on this subject

[@johnnywalkervip1]

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

[@kumargauravsingh6683]

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

[@ELFCloudGamer]

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

[@dorothybonsu8468]

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

[@l.kozasdiary7958]

I agree!!

[@yannaaguilar7367]

U teach more than my professors do

[@CebolwethuMawelele]

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

[@poosmi]

you're actually clutch for this one

[@albeezhuang5]

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

[@its.morrissey_xx1179]

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!

[@hamdiscorner5286]

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

[@solwane]

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

[@tiffanymyat6320]

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

[@hiramuazzam8490]

The best lectures are of ninja nerd

[@NahyaNassor]

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

[@abazaabdelmageid774]

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

[@kavitakar719]

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

[@ruthannfacey7586]

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

[@shreyaray5500]

You're the best teacher ever!

[@nargisjumahan1137]

You are awesome Ninja Nerd

[@FAR.1V]

I love this man

[@mahfa7513]

Thanks for your time to make this video great

[@mysticalpotato86]

This is gold. Thank you so much.

[@andisporepmathias.3717]

I love all of his Explaination.

[@j.sbhandari8813]

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

[@davidaminov7930]

"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!

[@AmalieKandel]

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

[@pillowwall2283]

FAVOURITE CHANNEL THANKYOU HOPE YOU LIVE A BEAUTIFUL LIFE 💜

[@yoshana2340]

Amazing and informative video

[@umarsiddiqui6488]

dude is a LIFESAVER!!!!!!

[@abdiwelimohamedali3164]

Best chenell so far

[@zanejansone-langina5943]

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

[@hamedhosseini4938]

Thank you so much Zach.

[@medico755]

Seriously a best lecture ❤️🙏

[@naikamal8175]

Terrific and glorious ninja

[@bugzybobo341]

You are raw talent… original and good. Thank you

[@hadinoori2718]

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

[@Ajaybarath]

Ultimate explanation sir 🔥🔥

[@ibtihelra3515]

thank you soooooooo much Zach

[@emiledyanne]

You are truly blessed! Thank you!

[@salahaldinfarhat5691]

Thank you as always for this amazing work of art !

[@jamesgordon8867]

I can't wait for the day when you have a contest for high school students and they give your whiteboard accounts accurately for scholarships. Think what kind of physicians we would have them.

[@sewaralqubailat1904]

You are a gift ❤️❤️❤️

[@vakskas2866]

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

[@Hasson-nd4xx]

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

[@nabodimma]

THANK YOU SO MUCH!!! Thank youuuuuuu.

[@kmb85045]

the best teacher

[@AkashKumar-gn6sh]

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

[@rimpimalakar2422]

Zack paaji tussii great ho ji .❤❤

[@abeikukimani8565]

you're a life saver

[@Emilio77able]

Amazing!

[@aanyagupta4245]

Huge fan of ur sir😊

[@lisagigi2893]

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

[@galbehar]

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

[@Zdnew]

Amazing ❤ thanks a lot ! 🙌🏻🙌🏻

[@assyfaatha665]

thank you for helping me pass the exam, sir Q_Q

[@MrBlazingup420]

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

[@afnan5470]

you make everything make sense

[@georgejeraldbanda2101]

THANK YOU

[@ameenoahmad]

Awesome video

[@linahb9911]

question : why does the rhodopsin have to accumulate ? in other words where did it go in the first place for it to accumulate ? thanks in advance .

[@the_accidental_doctor]

Ohhh man you are genius ❤️

[@learn4307]

Thanks sir....u r the best❤️

[@ashutoshjadhav7224]

u r best , thanks sir

[@yaemikorain]

I like before i watch.

[@krishnamurthyperumalla1489]

can u provide the link of visual pathway I am unable to find it

[@aimenshelly2986]

Thank you so much.

[@charlesevelyn6563]

thank you so so so so so so so much

[@meerafathima4479]

superb awesome sir

[@donadona5698]

You’re unbelievable!!!

[@muhammednishan4807]

Such a great lecture mahn😍

[@kavitachouhan4538]

Need the video on the embroyological development of human eye

[@LHost-sx2kk]

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]

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 )

[@dariocosemans8326]

Legend!

[@mainakbarai219]

Really helpful

[@shaungerald23]

Can you do a segment on color blindness? And the different types?

[@amyleepurton]

💛 thank you

[@atiqanabilah1576]

Thank you so much!!! 😭😭

[@vishalmotwani7664]

Yes god exists! I found you my lord! Hail you sir😊🔥💎

[@UkoOde]

Thank you

[@tasneemtaherali2893]

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]

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

[@a30s]

nice explanation

[@masikasauda7673]

Thank you sir

[@godofallgodswithnoothernam920]

Excellent

[@zaidkhan-yc3fd]

nice lecture 👍

[@suhaskumar7018]

Thanks a lot ❤️

[@mustafaeye7081]

Great, thanks so much

[@srish2536]

Lots of love ❣️🇮🇳

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[@LucianoJuly]

What an awesome engineer God is!

[@lawrenceyelkin6839]

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]

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.

[@ashleyd.5589]

thank you!!

[@LauraPerez-do9mv]

Thank you!!!!!

[@oop8599]

THANKYOU VERY MUCHIEEE