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Quiz Created by:
rosa stachniak
Creation Date: 13 December 2011
1. In the CNS and Maintain blood-brain barrier (B.B.B.) . They also have feet that wrap around capillaries.
d.ependymal cells
2. Removes debris, waste and pathogens by phagocytosis.
d.ependymal cells
3. Slow, over unmyelinated axons.
a.continuous conduction
b.all or none law
c.saltatory conduction
4. Stimulus alters resting membrane potential to -55 mV (threshold) AP.
b.saltatory conduction
c.all or none law (AP/impulse at the Node of Ranvier)
d.continuous conduction
5. Inside neuron is more negative than outside (-70 mV), Na+/K+ pump moves 3 Na+ to outside 2 K+ to inside uses ATP, Large negative proteins stuck inside cell and create the cells negative potential, Na+ and K+ channels are closed. More sodium on the outside and more potasium on the outside.
a.refractory period
d.resting membrane potential
6. Undershoots and can't fire yet. Ion gradient must be re-established. K+ & Na+ gates are closed, Na+ & K+ pump is redistributing...3 for 2 ratio - Na+ ions out and K+ ions in (back to correct location).
a.3rd event - refractory period
b.1st event - depoloration
c.2nd event - repolarization
7. +30 mV to -70 mV. K+ gate opens and K+ out of cell at +30 mV, Na+ gate is closed.
a.3rd event - repolarization
b.2nd event - repolarization
c.1st event - depoloration
8. AP arrives at synaptic terminal (bulb): Ca+2 channel opens, Ca+2 diffuse into cell, enzymes activated, neurotransmitter is released into synapse by exocytosis now in synaptic cleft.
9. Neurotransmitter attaches to receptor exciting or inhibiting postsynaptic neuron, separation of neurotransmitter to be recycled, vesicles without neurotransmiters are transported back to cell body,
a.post synaptic
10. EPSP (excitatory post synaptic potential):
a.Depolarization (Na+ channels open), turns cell "on", activates
b.Hyperpolarization, turns cell "off", deactivates
11. Excitatory chemicals:
a.Acetylcholine, Dopamine, Norepinephrine
b.GABA, Serotonin, Endorphins
12. Inhibit in brain valium is similar
13. Inhibit pain morphine is similar, runner' high.
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