Class notes
psyo-1011-sept-18th-lecture-notes-4
- Course
- PSYO 1021
- Institution
- Dalhousie University (Dal )
psyo-1011-sept-18th-lecture-notes-4
[Show more]
Seller
FollowContent preview
lOMoARcPSD|18482020Psyo 1011 - Sept. 18th - Lecture notes 4
Intro to Psyo & Nesc I (Dalhousie University)
Studocu is not sponsored or endorsed by any college or university
Downloaded by Abdel Ghanem (abdalrahman.ghanem@gmail.com)
, lOMoARcPSD|18482020
Sept. 18th
Ions move across the membrane through channels because of 2
different physical forces, electrical forces and osmotic forces.
Both these forces act on the ions inside and outside of the
neuron.
The electrical force pushes potassium in and the chemical force
pushes it out and since the chemical/ osmotic force is stronger,
the net force is out of the cell.
The equilibrium potential is the membrane potential at which the
electrical and osmotic/chemical forces are balanced and there’s
no net flow of ions across the membrane.
It can be used to find which direction the ion is going to move and
to know what’s going to happen as soon as the channel opens.
The equilibrium potential for sodium is +65mV
The resting potential should shift to the equilibrium potential for
the movement of ions to stop and the net movement becomes
zero.
The concentration of K+ outside a typical neuron is reduced by ½.
The K+ ions will move outside the cell. This makes the equilibrium
potential more negative as the osmotic force becomes stronger.
When you open the channel for a particular ion, the resting
potential will move towards the equilibrium potential of that
particular ion.
If the concentration of K+ outside the cell is more, the osmotic
force will be weaker so the equilibrium potential will be more
positive.
Downloaded by Abdel Ghanem (abdalrahman.ghanem@gmail.com)
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller abdelghanem. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for CA$11.59. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75632 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now