72684
Description
Flashcards by alexlpeart, updated more than 1 year ago
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Created by alexlpeart
over 11 years ago
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| Question | Answer |
| What is temporal coding? What is spacial coding? | Temporal coding is the way we send several nerve impulses along one nerve within a short period of time to indicated the magnitude of the input. Spacial coding is where we send impulses from several nerve to meet at one synapse. They can be excitatory or inhibitory. |
| Name the parts of a nerve and where they might be found. |
Image:
Nerve_cell.JPG (image/JPG)
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| When nerves are reformed, where are the axonal proteins formed? | In the cell body and then transported up the cell by micro tubules. |
| Does synaptogenesis take place only during early brain development? | No, it happens across our life span but we see an explosion of growth during early brain development. |
| what part of the nervous system can regenerate and which part cant? | Peripheral nervous system can regenerate while the CNS cant. |
| Which part of the nerve detects the change is chemical signaling indicating the direction it needs to grow? | Growth cone |
| What is the chemically driven response we see nerves undergo while detecting extra cellular chemicals in order to growth in the correct direction. | Chemotropic response. |
| What is axoplasmic flow? | The transport of axonal proteins down the micro tubules to the end of the nerve. |
| Where can the PNS regenerate up to if artificially cut and turned back towards the CNS? | The CNS/PNS junction |
| Give ways we can study what part of the brain does what. | Tracing the pathways of nerves using markers, Lesion studies (looking at people with damaged brains/nervous system and looking at the effects), Recording studies and simulation studies (brain stimulation, evoked potetials) |
| What does the nervous system allow us to control? | Movement, Secretion and thinking/information processing. |
| As the diameter of a nerve gets larger its conduction rate ____. This normally indicates that the nerve is more/less important. | Increases, more important |
| Describe the process of an action potential being formed, and then the cell repolarizing. | Provided the voltage is above the threshold value, voltage gated Na+ channels open. Na+ diffuses out of the cell, causing depolarization of the cell to a value of about +40mv. The K+ channels then open causing the K+ ions to flood into the cell repolarizing the cell, although due to the rapid moment of K+ the cell is hyperpolarized creating the refractory period. |
| Nerves action potentials are all or nothing, what is the problem with this system? Give the solution we have for this problem. | We don't know if the stimuli was large or small. We use temporal or spacial summation. |
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