012 The Absolute and Relative Refractory Periods

[colacasados]

Hello, and THANK YOU for your videos!!! They truly simplify information. Would you happen to have videos on ALL of the characteristics of Action Potential (including "nondecremental" & "irreversible")?

[LucifersCounterpart]

the day just smiled at me :D this is the best channel

i hav my physiology exam in 2 days n i couldnt understand certain things before finding this channel but as i said grrrrrr8 channel ;D

[UniGirl9008]

I have 1 question though, does that mean refractory period = hyperpolarization?

[InteractiveBiology]

@UniGirl9008 Unfortunately, Leslie has a lot of things to do at the moment, getting busy with the site, his work, and personal life. He's not had the time lately to check posts and get back to them. Please do stay tuned though as he'll be uploading more videos soon that may clarify your question. Thank you!

[wahid001]

@InteractiveBiology Or others could contribute to answer some questions while we wait for Leslie.

[yashsaxena1217]

@UniGirl9008 Nah, hyperpolarization is a phase not a phase. When the mV drops below -70mV its called hyperploarization, and when it goes back up to -70mV its called polarization. Refractory period is the time it takes for a Na+ channel to open again. This makes sure the action potential moves in one direction.



[fireandice5969]

@UniGirl9008 Refractory period = Repolarization. Hyperpolarization are the K+ ions going further down towards the -90mV range before the pump kicks in to return the Na+ and K+ ions to their resting membrane potential.

[2Aboody]

thank u for help me to understanding what the different between ARP and RRP

[InteractiveBiology]

@2Aboody Glad we were able to help. Please stay tuned for more Biology learning and fun. We have more Biology videos to be uploaded very soon!

[thamer7A7]

thank you so much

[InteractiveBiology]

@thamer7A7 You're welcome! Stay tuned for new Biology videos coming very soon!

[goozbye]

You are amazing, thank you so much!!! 

[InteractiveBiology]

@goozbye You're very welcome :) Please stay tuned. We have more Biology videos coming to the website soon!

[lindaandjeffsampson]

Wow! Great teaching, wish you were my teacher @ school. My teacher goes too fast.

[InteractiveBiology]

@lindaandjeffsampson Thank you :) Glad to know you appreciate this. There are more Biology videos in the website that you might want to check out. Stay tuned for more new videos! :)

[wackomackopaco]

THANK YOU!

[InteractiveBiology]

@wackomackopaco You're welcome! Please stay tuned for more Biology videos! :)

[skinnimelon]

p.s. Is it correct that action potential is not initiated unless the potential difference reached +40mV(the peak)?

[InteractiveBiology]

@skinnimelon Thank you for watching the video. Unfortunately, Leslie is busy at the moment working a lot on improving the site. He is unavailable to answer any more questions. In the meantime, please go to our site directly for more Biology videos. New episodes will be uploaded very soon!

[skinnimelon]

The OCR A2 textbook stated that "For a short time after each action potential it is impossible to stimulate the cell membrane to reach another action potential". Another internet source also said that "Immediately after an action potential, the neurone enters a refractory period". So does the absolute refractory period occurs before or after an action potential is reached(+40mV)?

[skinnimelon]

thank you!

[InteractiveBiology]

@skinnimelon You're welcome. Stay tuned for more!

[r3dfreak]

thanks for the wonderful and clear explanation!

[InteractiveBiology]

@r3dfreak You're welcome!

[Djalitana]

Oh I found it. please disregard my request about making a vid about refractory period. now I understand, the sodium chanel doesn't close like bang. it closes gradually right? and this causes that the second stimulus needs to be stronger than the first one to produce an action potential?! thanks for this clip

[InteractiveBiology]

@Djalitana No prob. Glad you found it.

[crackowacko87]

Hi again Leslie, is it possible you do a lecture video on calcium channels involved in heart contractions? It would really help as I have a thesis to do and I need some tips and assistance in understanding the concepts before I start writing them. Thanks!

[InteractiveBiology]

@crackowacko87 I do have those videos, check out episodes 45 - 47. I deal with those topics there. All the best!

[crackowacko87]

Hi Leslie, so am I correct to say that the Absolute Refractory period is longer than the Relative Refractory period? Or are they of the same duration? Thanks!

[InteractiveBiology]

@crackowacko87 No, the relative refractory period is longer. It starts at the peak of the action potential and continues until the resting membrane potential is restored. Hope that helps!

[warpedoctave]

ive read guyton a couple of times, for hours on end and it finally made sense watching this video, God Bless thanks......... : )

[InteractiveBiology]

@warpedoctave Glad to know the videos are helping. Stay tuned for MANY more to come :)

[yanirmt22]

thanks a lot... it makes my review so easy to understand... God bless

[InteractiveBiology]

@yanirmt22 God Bless you too. Glad to know the videos are helping :)

[betsyrobles32]

thanks alot help me understand it !!!:)

[ediniz101]

hi i love thevideos but i have a couple of questions umm firstly what causes the ion gates to open or close or be inactive? and why do the Na+ and K+ gates open at different times?

thank you

[InteractiveBiology]

@ediniz101 Those questions are answered in Episodes 9 - 11 and 14. Check out those videos. They should help!

[fandanstan]

@ediniz101 Basically, a graded potential that causes membrane potential to go above threshold initiates an action potential, which causes the ion gates to open.

The K voltage-gated channels open slower than the Na ones do, which is why they open at different times.

[BreatheinStandstill]

This is so great, thank you so much! My prof feeds me gibberish, so thank goodness for your videos. :)

[InteractiveBiology]

@BreatheinStandstill LOL, it's kinda hard to understand gibberish ;)

Glad you found value in the videos!

[TheRobbert1992]

Thanks a lot!

[InteractiveBiology]

@TheRobbert1992 You are very much welcome :)

[InteractiveBiology]

@Matt18a That's what we do at Interactive Biology - Save Lives, lol. Hey, glad to know that you are getting value from it. Make sure to subscribe and stay tuned :)

[katelayt]

This video explains everything so much better than my textbook...and my professor!

Thank you so much!!!

[InteractiveBiology]

@katelayt Well, I'm glad I can help. All the best with your class!

[jimmyt1222]

Awesome video. Thanks so much for doing this. It would have taken me hours of reading from a textbook to reach this level of understanding. Thank you, thank you, thank you.

[InteractiveBiology]

@jimmyt1222 You are very much welcome. Glad you are finding value in it. Stay tuned because there's much more to come :)

[LaSuraya1]

Thank you very much, your videos are great!

[InteractiveBiology]

@LaSuraya1 Thanks Laura. Glad you like it :D

[adeelfromny]

Thankx man, This was helpful.......

[InteractiveBiology]

@adeelfromny Glad you find it helpful. Many more coming, so stay tuned :)