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Sensory (afferent) neurons
Detect changes in body and external environment
Info transmitted into brain or spinal cord
Ability to respond to changes in the body and external environment called stimuli
Perikaryon = soma
Single, central nucleus with large nucleolus, cytoskeleton of microtubules and neurofibrils
Most abundant glial cells
- contribute to Blood Brain Barrier (BBB) and regulate composition of brain tissue fluid
Speed of Nerve Signals
Large, myelinated fibers > small, myelinated fibers > small, unmyelinated fibers
Resting Membrane Potentials
~-70mV inside the cell comparing to outside the cell
- electrolytes such as Na+ and K+ pump in/out to maintain the equilibrium
1. Occurs on a part of the neuron when that part has been stimulated
2. They are graded and decremental (it gets weaker as spread out more)
3. Reversible, work like a dimer
Electrical information found on axon, only be found within an axon and it will only occur if that trigger zone said it should occur
Characteristics of AP
2. Always be the same, if it occurs, it occurs all the way
like a light switch
Relative Refractory period
Action potential/axon can make another action potential, but the stimulus for that to occur has to be greater than normal
Purpose of Refractory Period
Preventing back-fire of the conduction, so the electrical msg only go down one direction
Myelinated fibers insulate the fibers, make the skips down, only the nodes of Ranvier conduct down
Neuron use other chemicals as neurotransmitters
Amino acid neurotransmitters
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