Term
| What makes up the CNS? PNS? |
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Definition
CNS: Brain and spinal chord
PNS: cranial and spinal nerves |
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Term
| What makes up the brain stem and what does each part do? |
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Definition
Diencephalon: hypothalamus, thalamus (visual), epithalamus (hormone)
Mesencephalon (sense and motor)
Pons (cardiovasc and resp nerves)
Medulla Oblongata (attaches spinal chord( |
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Term
White matter vs. Gray matter.
THeir location in relationship to eachother in the brain and spinal chord |
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Definition
White matter: dendrites and axons
Gray: soma
brain is gray inside, white outsides
spinal chord is opposite |
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Term
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Definition
oligodendrites: in brain
neurolemmocytes/schwann cells: in PNS |
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Term
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Definition
| resting membrane potential (-40 to -90 mV) |
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Term
| at RMP what are the charges of inside and outside a cell? |
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Definition
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Term
| what's the RPM of neurons? |
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Definition
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Term
| what's the relative distribution of K+ and Na+ in and out of a cell? |
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Definition
High K+ inside
High Na+ outside |
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Term
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Definition
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Term
| How does diffusion contribute to RMP? |
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Definition
| K+ want to leak out, so they do. But they also bring negatively charged things to the membrane, leave them behind then stick to the outside of the membrane while the neg charged thing is sticking to the inside of the mem. |
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Term
| How does Na+ K+ pump contribute to RMP? |
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Definition
| 2 Na+ pumped out for 1 K+ in |
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Term
| What never happens in regards to K+ in and out movement? Describe what it is and why it never happens. |
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Definition
| Electrochemical Equilibrium. This is when there is no net flux of K+. Never happens because K+ is always diffusing out.Na/K+ also helps keep things moving and some Na+ influx occurs. |
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Term
| What is the diffusion potential of Na+? |
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Definition
| High Na+ outside and outside posi make Na+ want to diffuse down into the cell. |
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Term
| Why is K more influential in the RMP than Na+ |
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Definition
| The mem is more permeable to K+ and leak channels conduct more K+ than Na+ and therer is a greater conc. grad of K+ than Na+ |
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Term
driving force
describe how it is determined and what the sign of it means |
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Definition
stored energy with potential to move ions across a membrane
DF= equilibrium potential for the ion-voltage at rest
negative means out of cell |
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Term
| what's the driving force for K+? |
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Definition
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Term
| what has a greater driving force, K or Na? why so large? |
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Definition
| Na, Na has less permeability to pm. |
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Term
| why doesn't Na+ seep out of the inside of a cell, attached to some negative thing that it drops of at the membrane? |
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Definition
| it is more stuck to the inside negative things that the k+ is. |
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