BGYB30H3 Lecture 3 Notes The Action Potential 1 Sep 17
BGYB30H3 Lecture 3 Notes The Action Potential 1 Sep 17

2 Pages
Unlock Document

University of Toronto Scarborough
Biological Sciences
Ingrid L.Stefanovic

BGYB30H3 Lecture 3 Notes -all cells try to maintain resting potential (nerve and muscle cells) -these cells respond to changes in membrane permeability by opening and closing ion channels -electrodes are used to give voltage readings through a voltmeter (able to measure differences in membrane potential between IC and EC compartments -membrane potential difference is relative to 0 -depolarization is that membrane potential is moving towards 0 -hyperpolarization is that membrane potential is moving more negative than resting membrane potential -repolarization is that membrane potential moves away from 0 to resting membrane potential -sodium channel has inactive and active gate -at rest, sodium active gate is closed and inactive gate is open -depolarization involves opening active gate -at 30mV, inactivation gate closes, in repolarization, activation gate closes -sodium flux happens when both gates are open -the two types of potassium channels are leak and non leak channels -at RMP, leak channels are open and non leak are closed -depolarization involves leak channels closed and non leak channels are opened -hyperpolarization involves leak channels open and non-leak channels are closed -potassium channels are slow to activate and inactivate -sodium channels are quick to activate and inactivate -changes in membrane potential are localized in the cell membrane while the rest of the cell is negatively charged -IC and EC are relatively stable - ooKKL}L]o}ZL[ ZK] Z}K}Z
More Less

Related notes for BIOD27H3

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.