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10 Cards in this Set
- Front
- Back
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Astrocytes form? |
White matter (fibrous astrocytes) Gray matter (protoplasmic) |
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Axoplasmic transport requires? |
Calcium. ATP. Microtubules. |
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Microtubules |
Serve as "tracts". Molecular motors Dyenin, Kinesin. |
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Microfilaments? |
Solid tubes, sometimes used as tracts. |
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Types of axoplasmic transport ? |
FAST Anterograde 400mm/day (vesicles, lysosome, neuro peptides, mitochondria, reticulum ) FAST Reterograde 200mm/day (dyenin, neurotrophic viruses, tetanus,toxind, nerve growth factors) SLOW 0.5-10mm/day ONLY SLOW ANTEROGRADE |
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RMP of most neurons? |
-70mv |
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RMP of large motor neurons? |
-90mv. Contribution of NaK Puml-only -4mv |
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Effect of hypokalemia in RMP. |
Hyperpolarisation. Decreased excitability. Muscle weakness |
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Effect of hyperkalemia. |
Depoloarisation. Increased excitability. Arythmia common. |
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Severe hyperkalemia. |
Persistent depolarosation leading to TALL TENTED t waves and WIDENED QRS, decreased contractility of heart, heart may stop at diastole. |
