Hearing & Balance: Crash Course A&P #17

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1. I love these videos, but I just wanted to clarify an error in this video: The hair cells have mechanically gated potassium (not sodium) channels. And the depolarization of the hair cells arises from the influx of potassium NOT sodium. This is because the hair cells have their stereocilia protruding out into the endolymph of the cochlea duct, where the potassium concentration is very high (relative to inside the hair cell). The apical part of the hair cell therefore have a membrane potential of around -150 mV at rest and when the potassium channels open, potassium rushes into the cell down its electrochemical gradient, making the membrane potential less negative (depolarization). Potassium escapes the hair cell at the basal end via calcium gated potassium channels, where potassium runs from the hair cell out into the perilymph of the tympanic canal, where the potassium concentration is low relative to the inside the hair cell.
2. I think I have another ear infection. At any rate, my right ear is, for whatever reason, infection or otherwise, pretty messed up.
3. Solid "Labyrinth" animation ;)
4. Love crash course!!!!
5. There's a their/there error in the description of the video.
6. These videos are going to be the reason I pass my A&P final
7. Can someone explain me what is endolymph fluid in inner ear?
8. i love all your video
9. this was amazing thank u so much
10. Crash Course series.....The Best Series.... Keep it 👆 👆 👆
11. superb video Sir understood all about ear
12. idk y but the little bone vibrating at 3:14 makes me laugh so much
13. Thank you Crash Course you made physiology so simple and enjoyable :*
14. I want to add that the reason your brain's response to conflicting visual and inner ear 'I'm moving' messages is to throw up is because it thinks that you've been poisoned and are going to die, so it throws up to get the assumed poison out of your body.
15. i thought it was K+ that allows for the depolarization of the organ of corti in the cochlea rather than Na like you mentioned. can someone clarify?
16. More specifically, the brain concludes that moving while sitting still doesn't make sense and thinks you probably ate something wrong and now you're poisoned, that's why it wants you to throw up!
17. I'm here because grindcore
18. Great video. Really helped me in my A&P course. Thanks for posting!
19. epic sax
20. Thank you so much! You rock! I watch all your videos as I learn about each subject and they help me so much! You are also entertaining as hell so it makes me actually want to learn.