Photoreceptors (rods vs cones) | Processing the Environment | MCAT

Photoreceptors (rods vs cones) | Processing the Environment | MCAT | Khan Academy

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11 жыл бұрын

In this video, I explore the similarities and differences between rods and cones. By Ronald Sahyouni. Created by Ronald Sahyouni.
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Пікірлер: 74

@gavinh2614 3 жыл бұрын

Please note that the discs inside a rod are NOT called optic discs. The optic disc is equivalent to the blind spot since this is where the optic nerve is exiting the retina. It's important to know that there are no rods or cones in the optic disc as well

@rawdonwaller 8 жыл бұрын

as someone else commented: action potentials only arise from the ganglion cells.

@zuhraaziz8225 9 жыл бұрын

I don't know if Khan academy has already done this or not, but you should make a video on the visual pathways (Geniculostriate, tectopulvoinar, and Retinohypothalamic). It is a bit hard to understand just by reading about them from the textbook.

@johntepp 7 жыл бұрын

rods and cones dont fire APs, just transmit graded potentials.

@edwinrelf8454 10 жыл бұрын

Rods and cones do not fire action potentials

@savannahtallino8534 7 жыл бұрын

Looks like the video (at the end) is also incorrect about dark vs. light adaptation (they got it backward). Bummer. Was going to use this video to help my students but there's too many conflicting details and I don't want to confuse them.

@Juhcamposc 4 жыл бұрын

What a great explanation! Thank you

@christiandorcaskisely3946 3 жыл бұрын

Thanks a lot ! Great video ! Well illustrated

@PhysiologyOpen 3 жыл бұрын

In rods the discs are not membrane-bound, they are free-floating..In cones, they are membrane-bound. Also as many people mentioned, rods and cones don't fire action potential

@adamjzimmer 6 жыл бұрын

I spent a solid hour of searching to find this exact explanation, and then I read the comments and key parts are wrong?? If this is not accurate you should delete or edit the video. You're misinforming people. If you have other videos, you should fact check them and make sure you're correct when stating scientific facts.