A Level Biology Revision (Year 13) "The Resting Potential"

[@kingplatform2255]

I am in uni, and I am back watching these videos

[@saysikeern202]

Bro is js that helpful it doesnt matter what ur studying we js always end up coming back to bro

[@Zero-eb4oq]

the king is saving my exam this morning

[@ferguskinley860]

Hi sir, when will you be finished making the A level videos?

[@mammmm7921]

Can someone explain to me why potassium ions needed to be actively transported in, only to just let them diffuse out again???

[@Freesciencelessons]

That helps to establish the resting potential.

[@belugasbro779]

At the first stage when potassium ions are actively transported every 3 sodium ions out is equal to 2 potassium ions in this causes the axon outside the membrane to have a higher or more positive charge when compared to the inside.Then when we diffuse out potassium ions through the ions channels we are essentialy repeating this but with potassium ions being diffused out rather than in. Not only that but,As potassium ions diffuse out a faster rate than the sodium ions entering this creates a polarized difference as more positive ions are being diffused than taken in. So basically the first stage is a just a temporary balance of charges and the 2nd stage is to make the outside and inside of the membrane polarized thus returning back to its original stage

[@ferguskinley860]

Hi sir, when will you be finished making the A level videos?