Term
| What is the difference between dentrites and axons? |
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Definition
| Dentrites recieve incoming signals. Axons carry outgoing information. |
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Term
| How are neurons classified? |
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Definition
| Neurions can be classified according to function or structure. |
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Term
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Definition
| Pseudunipolar (somatic senses) has mylien seath, Bipolar (smell and vision) no mylien, multipolar recieves info. and anaoxic support the immune sysytem |
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Term
| Difference between afferent and efferent |
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Definition
| Afferent (ascending) neurons send signals to the brain. Efferent (descending) send singal out to a muscle or gland etc. |
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Term
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Definition
| moves material cytoplasmic (axoplasmic) flow 0.2-2.5 mm/day |
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Term
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Definition
| moves organelles at a rate up to 400 mm/day |
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Term
| two types of fast axonal transport |
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Definition
retrograde(backward) axon to cell body
anterograde(foward) cell body to axon terminal |
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Term
| in the PNS what type of cells make mylien sheaths |
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Definition
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Term
| what type of glial cells are found in the PNS? |
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Definition
| satellite and schwann cells |
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Term
| type of glial cells found in the CNS |
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Definition
| oligodendrocytes(makes mylien sheath), microglia(immune cells), astrocytes and ependymal cells |
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Term
| does white matter have more mylien sheath than grey matter? |
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Definition
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Term
| gaps between mylien sheath |
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Definition
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Term
| Resting membrane potiential of a neuron |
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Definition
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Term
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Definition
| membrane potiential to which a membrane has to be depolorized to initiate an action potiential; what has to happen before it can get excited. |
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Term
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Definition
| mechanically, chemical, and voltage |
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Term
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Definition
| decrease in strength as they spread out from the point of origin |
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Term
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Definition
| amount of time it takes for an excitable membrane to be ready for a second stimulus, once it returns to its resting state following excitation |
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Term
| Types of refractory period |
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Definition
absolute( a second action potential cannot be initiated)
relative( a second action potential is inhibited but not immposible) |
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Term
| Neurons detect the strength and duration of stimulus be the..... |
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Definition
| frequency of action potentials( the code) |
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Term
| Graded potentials are intergrated and the action potential begins(if signals are above the threshold levels) |
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Definition
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Term
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Definition
occurs when action potential jumps from node to node
no mylien = a ton of na+ channels |
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Term
| Chemical synapses, interneuron, and electrical synapses |
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Definition
| chem. use neurotransmitters, inter. just pass the electrical signal, and elect. pass electrical signals |
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Term
| Neurotransmitters(neurocrines) |
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Definition
| ACH, amines, amino acids, purines, gases, peptides, lipids |
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Definition
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