Exam (elaborations)
Nerve Conduction and Neurotransmission Questions with Correct Answers.
- Course
- Institution
Nerve Conduction and Neurotransmission Questions with Correct Answers.
[Show more]
Content preview
Nerve Conduction and Neurotransmission Questionswith Correct Answers
Signal along brain circuits (2 Steps) Correct Answer-1.) Nerve Impulse
Conduction- passage of electrical signal along a neuron ((+) deflection
of membrane voltage)
2.) Neurotransmission/Synaptic Transmission- transmission of a nerve
impulse from one neuron to another
Neuron structure Correct Answer-Dendrite- inc. SA of cell body;
covered in synapses (tiny protrusions- receive info from other neurons
and transmit electrical signals to the soma)- up to 10,000 signals
Soma/Cell Body- where the signals from dendrites are joined and passed
on.
Axon Hillock- at end of soma, controls firing of neuron. Action Potential
if strength of signal >> threshold limit
Axon- elongated fiber that extends from cell body to terminal ending to
transmit a signal
-larger an axon, faster the transmission
Axon Terminal- transmits signals to muscle, gland, other neurons
Every ion has an Equilibrium Concentration (Reversal Potential) that is
determined by... Correct Answer-The relative conc. of the ion between
the two compartments, as well as the ion's charge.
-if unequal and permeability allowed, a voltage will develop
-Equilibrium Concentration- ratio of the conc. of ion on either side of the
barrier
, Nernst Equation Correct Answer-Ex = (60/z)log([X out]/[X in])
Ex- voltage in mV
z- ion charge
[ ]- ion concentrations
-equation tells you the voltage if ions unevenly distributed
**Resting Potential is (-) due to K+ build up in the cell
Intracellular Ion Conc:
K+ = 140 mM
Na+ = 4 nM
Cl- = 4 nM
Ca2+ = 0.1 nM
overall -60 mV Correct Answer-Extracellular Ion Conc:
K+ = 4 mM (hyper polarize)
Na+ = 140 mM (depolarize)
Cl- = 140 mM (hyper polarize)
Ca2+ = 2 mM (depolarize)
increase (+) --> depolarization; more excitable and inc. chance of AP
increase (-) --> hyper polarization; less excitable and dec. chance of AP
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 cracker. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $15.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
78252 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now