100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Previously searched by you
Previously searched by you
logo
Summary neuroscience, neurophysiology CA$15.47   Add to cart
Quickly navigate to
Preview
  2.  
  3. Vrije Universiteit Amsterdam (VU)
  4.  
  5. Neurosciences

Summary

Summary neuroscience, neurophysiology

1 review
 46 views  1 purchase
  • Course
  • Neurosciences
  • Institution
  • Vrije Universiteit Amsterdam (VU)

I passed this course with the help of these summaries with a 9! It contains all lecture material including all slides. NOTE: I used the anatomy slides that were given and the summary Antonio made. These are not included in this summary. This was sufficient!

Preview 4 out of 82  pages

Document information

  • June 21, 2023
  • 82
  • 2022/2023
  • Summary

Subjects

  • neuroscience
  • neurophysiology
  • biomedical sciences

Written for

  • Vrije Universiteit Amsterdam (VU)
  • Biomedical Sciences
  • Neurosciences
All documents for this subject (56)

1  review

review-writer-avatar

By: keermarie • 7 months ago

Seller

avatar-seller
lvd26

Reviews received

Content preview

Summary Neuroscience

Lecture 1&2: membrane potential

Resting membrane potential

Learning objectives:
-knowing the difference between active and passive conduction
-be able to explain what the equilibrium potential or reversal potential is
-understanding how the resting membrane potential is established
-knowing which ions are important for the resting membrane potential
-knowing for which ions the permeability changes during the action potential
-knowing how to calculate the resting membrane potential when the membrane is
permeable for 1 ion, or multiple ions

Electrical signals in the brain
All the output of the brain is generated by electrical signals.

Electrical signals in nerve cells



These cells translate a stimulus into a
receptor potential.


Nerve cells are connected with each other
through synapses. An axon potential arises
and must be translated into a chemical signal
to convene its message to its next neuron. It
does so by releasing neurotransmitters
which will be sensed by the post-synaptic
transmitter in the synapse and that will
generate this synaptic potential.

An action potential is a signal when a neuron
is being activated (for instance by receptors
or other neurons) leading to depolarization
and an action potential→ very strong short
pulse.


When we try to distinguish the different signals, we see
- A different source
- The amplitude of the action potential is much bigger
- The time of depolarization is shorter in the action potential

,What are the requirements for electrical signaling between nerve cells?
- must be fast
- travel long distances
- should not loose strength over distance (reliability> amplitude must stay the same)




The action potential is quite preserved in animals, making studying them easier.

Active and passive signals
We have a neuron and two electrodes (electrophysiology). With one we can stimulate the
neuron and the other record the signal in the neuron.
You stick the electrode inside the cell, measuring the potential inside versus outside
(reference electrode in a bath) and you measure the potential difference between these two
electrodes. Nerve cells are hyperpolarized, they have a negative resting membrane
potential. If you have the electrode in the bath, you measure the (before inserting) you do
not have a potential difference=0. When you insert the measuring electrode in the cell, you
measure the cell's resting potential (-65).
We give a negative injection (e-) of a current and then we see as a response a negative
reflection of this current potential. If you give a twice as big negative injection, then the
hyperpolarization will be twice as strong. This is called passive responses.
When we give a positive stimulus (below threshold) resulting in depolarization. When we
increase the amplitude of the positive stimulus twice (reaching threshold), we get an active
response, an action potential. What will happen if we give even stronger stimulation? →the
action potential will not change but the firing frequency is increased (can be explained by
the membrane potential).

,→ doesn’t work when you have a long axon




Extra: Excitation and inhibition




Active and passive signals are deviations from the resting membrane potential
What determines the resting membrane potential?

, Resting membrane potential is the electrical potential difference measured across the
membrane (inside with respect to outside→ reference electrode necessary)
• Based on two membrane properties:
-lipid bilayer is impermeable for ions
-specialized ion channels can conduct ions selectively (only one ion group can pass)
• Based on two principles in physics:
-diffusion of particles
-electrical forces between electrical charges




The chance of particles diffusing to lower
concentration is higher than vice versa.




Know the charges by heart

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

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

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

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 lvd26. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for CA$15.47. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

76658 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling
CA$15.47  1x  sold
  • (1)
  Add to cart