DPT 712: NERVE, NERVE CONDUCTANCE, ACTION POTENTIALS AND NEURONAL SIGNALING EXAM QUESTIONS AND ANSWERS VERIFIED GRADED A++
0 view 0 purchase
Course
DPT 712
Institution
DPT 712
DPT 712: NERVE, NERVE CONDUCTANCE, ACTION POTENTIALS AND NEURONAL SIGNALING EXAM QUESTIONS AND ANSWERS VERIFIED GRADED A++
dendrite
where information comes to
presynaptic
nerve cell that releases a neurotransmitter into a synapse; before the synapse
post-synaptic
the nerve cell to which the...
nerve cell that releases a neurotransmitter into a synapse; before the synapse
post-synaptic
the nerve cell to which the neurotransmitter binds.
cell membranes create a separation of electrical charges and ion concentrations
creating an __________________ gradient and a __________________ potential
electrochemical; membrane
what ion plays the most important role in generating the resting membrane
potential
K+ (potassium)
Resting Membrane Potential
-separated electrical charges of opposite signs create a potential difference (like a
battery) called.....
-the size of this potential difference is determined by the difference in amount of charge
between the 2 compartments which reflect ionic concentrations
, what happens to resting membrane potential of cardiac muscle cells when the
outside concentration of K+ declines by 50%?
makes it more negative and then makes it harder for the axon to conduct action
potential
Membrane Potentials
this depends on 2 factors:
-difference in specific ion concentrations in the intracellular and extracellular fluids
-differences in membrane permiability to the different ions which then reflect the number
of open/closed channels for the different ions in the plasma membrane
How does the membrane potential move?
1. no ion movement, all ion channels closed
2. K+ channels open, K+ moves down its concentration gradient. Na+ ions do not move
as their channels are closed
3. After a few K+ ions have moved, the "compartments will have an excess of positive
charges, leaving behind an excess of negative charge.
4. Electrical gradient differences (increased negativity) will attract K+ ions back into the
compartment
5. An equilibrium for K+ will be established by a concentration gradient favoring the
movement of K+ into the compartment 2 and the increased negativity in compartment 1
electrical gradient, pulling K+ back into compartment 1
6. system will achieve equilibrium when these two opposing movements reach a value
of 0.
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 AcademicSuperScores. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $9.99. You're not tied to anything after your purchase.
