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| Organization of the nervous system |
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generate and propagate electrical signals
- are excitable
[image]
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Form myelin sheaths that act as insulation around nerves
- CNS
[image]
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Form myelin sheath
- PNS
[image]
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blood brain barrier
(doesn't allow immune cells in either)
[image]
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| immune cells in nervous system |
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borders and Cerebro-Spinal-Fluid
[image]
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propogate an electrical signal in response to a stimulus
- neurons and muscle cells
[image]
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*pseudounipolar
*bipolar
*multipolar
[image]
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| Ion movement across membranes creates electrical signals |
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Definition
Changes in ion permeability change the membrane potential
[image]
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| Electrical signals in neurons |
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Definition
graded potential
action potential |
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can vary in magnitude
- in order for a cell to fire an action potential, need at least 55 mV |
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| all or nothing when it comes to action |
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where action potential begins
[image]
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| Voltage gated ion channel |
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| What happens if the stimulus is less than 55 mV (does not reach threshold)? |
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Definition
| Nothing. It needs to reach threshold in order to continue trasmission |
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