Excellent presentation Professor. People will view their eyes differently after this... Lol. I will be watching all of your posts . Thanks for sharing! 👓
While I describe how a photochemical reactions excites the photoreceptor (to generate an AP), in actuality the photochemical reaction causes a hyperpolarization. In any case this leads to the release of the excitatory neurotransmitter "glutamate" (onto the "bipolar cells").
professorfink isnt it true that hyperpolarization *inhibits* the production of neurotransmitters? If that is the case, could we assume that cell's function is the detection of what is missing from the totality of potentially detectable wavelengths by cones rather than positively reacting to what is present?
Thank you for the color blindness explanation, I'm one of the very few women who are colorblind, I couldn't see the last one, the one you said was a 2. I've never really understood how it works.
I really enjoy your lectures Professor Fink. When I dont get something my prof taught us in class or even other videos on the subject on youtube, I can find your lectures and it is easy to soak in and get :) Thank you!
Dogs and cats DO have cone photoreceptors, they are just very few and limited in their type..."Dogs do see colors. However, canine cones account for only 10% of their fundic photoreceptors. Two distinct types of canine cones are known to exist. The first is maximally sensitive to violet light, and the second is maximally sensitive to yellow-green light. The color visual spectrum perceived by dogs is therefore divided into two hues, blue-violet and green-yellow. The remaining orange-red range of the visual spectrum is probably perceived as yellow. Dogs fail to differentiate green, yellow, orange or red objects. Dogs also fail to differentiate blue-green from gray objects. The color vision of dogs therefore strongly resembles human red-green color blindness" (www.vmcli.com/veterinary-articles-does-my-dog-see-in-black-and-white.html) paragraph 4 "Cats can see color, but they do not have as many color-sensitive photoreceptors as humans. Colors that would appear to be very rich to us are more pastel-like to the cat. Cats respond to the blue and yellow wavelengths best, but have trouble with green and red. What appears to us as “red” is simply “dark” to cats. A fraction of the green spectrum in cats is indistinguishable from white. Cats would see a green, grassy lawn as a whitish lawn, and a green rosebush with red roses would appear as a whitish bush with dark flowers. Cats, however, are very good at distinguishing many different shades of gray" (manhattancats.com/Articles/eyes.html) paragraph 5
i hate these lecture although they are informative but when he claps dont know why make the whole thing crap...plx dont do it in you further lectures ...
it adds emotion to his lecture. you start your sentence with you "hate" these type of lectures, doesn't look like you'd be satisfied with claps or no claps. bye!
You’re a great teacher❤ Love from Nigeria
I'm watching this in nursing school. thank you for all you do professor Fink!
I like the way you simplify biological terminologies.Thanks professor.
Informative, easy to understand, perfect for biologists who's first language is not english. Thank You Proffesor Fink!
Another brilliant, interesting and informative video from Professor Fink, thank you sir!❤
You are back ! Thank you.
Excellent presentation Professor. People will view their eyes differently after this... Lol. I will be watching all of your posts . Thanks for sharing! 👓
Thank you, I was able to get A in anatomy because of your lectures.
Thank you ever so much for uploading all these great lectures Professor Fink!
These lectures are the best!! Love your enthusiasm, thank you for the presentation!!
Thank you professor Fink , you help me a lot with my physiology and anatomy clasS. You are a genius. God bless you
Thank you Professor
Thanks .these videos really do help more than my teachers do
Professor Fink explains very well and effectively, I really enjoyed this lecture.
Absolutely an awesome teacher!
Thankyou Professor Fink love your videos
This is great! Thank you for taking the time to teach it and share it. Is there a way I can get this document you are pointing out?
Best lacture......love you sir..
you are excellent
6:22 "leads to an action potential"? can that be expressed in chemical terms? does "action potential" mean that neurotransmitters are produced?
While I describe how a photochemical reactions excites the photoreceptor (to generate an AP), in actuality the photochemical reaction causes a hyperpolarization. In any case this leads to the release of the excitatory neurotransmitter "glutamate" (onto the "bipolar cells").
professorfink
isnt it true that hyperpolarization *inhibits* the production of neurotransmitters? If that is the case, could we assume that cell's function is the detection of what is missing from the totality of potentially detectable wavelengths by cones rather than positively reacting to what is present?
Certainly, photoreceptors function opposite to other neurons. Why that it is that way is unknown. Your speculation is interesting.
THANK YOU PROFESSOR FINK
A complex topic made easy, thank you!
Great explanation! Thanks!
this is the only video about visual system physiology ??
awesome teacher!
sir i would like to ask that if a person has red cone missing why does red look like green ? why not blue ?
Thank you very much professor
Thank you for the color blindness explanation, I'm one of the very few women who are colorblind, I couldn't see the last one, the one you said was a 2. I've never really understood how it works.
im not colorblind and even I had trouble seeing that number 2
Good job professor!
Can you please discuss about Retinitis Pigmentosa?
I really enjoy your lectures Professor Fink. When I dont get something my prof taught us in class or even other videos on the subject on youtube, I can find your lectures and it is easy to soak in and get :) Thank you!
Thank you.👍🏻
Thank you very much professor Fink :))
Dogs and cats DO have cone photoreceptors, they are just very few and limited in their type..."Dogs do see colors. However, canine cones account for only 10% of their fundic photoreceptors. Two distinct types of canine cones are known to exist. The first is maximally sensitive to violet light, and the second is maximally sensitive to yellow-green light. The color visual spectrum perceived by dogs is therefore divided into two hues, blue-violet and green-yellow. The remaining orange-red range of the visual spectrum is probably perceived as yellow. Dogs fail to differentiate green, yellow, orange or red objects. Dogs also fail to differentiate blue-green from gray objects. The color vision of dogs therefore strongly resembles human red-green color blindness" (www.vmcli.com/veterinary-articles-does-my-dog-see-in-black-and-white.html) paragraph 4
"Cats can see color, but they do not have as many color-sensitive photoreceptors as humans. Colors that would appear to be very rich to us are more pastel-like to the cat. Cats respond to the blue and yellow wavelengths best, but have trouble with green and red. What appears to us as “red” is simply “dark” to cats. A fraction of the green spectrum in cats is indistinguishable from white. Cats would see a green, grassy lawn as a whitish lawn, and a green rosebush with red roses would appear as a whitish bush with dark flowers. Cats, however, are very good at distinguishing many different shades of gray" (manhattancats.com/Articles/eyes.html) paragraph 5
thanks for this comment, I appreciate
professor fink said they don't. so if they had now they don't. professor fink number 1 fan
I am being sarcastic
:)
Now I get it! :D
thanks a lot
every time I see this kenhub add I am so happy; because I know, that I will never need this shitzz since I passed
14:36 I thought i was colour blind for a second there.
fovea= only cones, macula= mostly cones
i hate these lecture although they are informative but when he claps dont know why make the whole thing crap...plx dont do it in you further lectures ...
it adds emotion to his lecture. you start your sentence with you "hate" these type of lectures, doesn't look like you'd be satisfied with claps or no claps. bye!