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16 Cards in this Set
- Front
- Back
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What are multipolar cells? |
Have numerous dendrites extending from them |
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What are bipolar neurons? |
Have 2 processes extending from them - 1 is the dendrite - 1 is the axon terminal (normally sensory info) |
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What are unipolar nuerons? |
Have 1 process extending from them - soma (cell body) outside of the axon...sensory info comes in--> goes to cell body --> goes to CNS |
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What are 4 types of glial cells? |
- Oligodendrocytes - astrocytes - microglia - ependymal cells |
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What are the function of oligodendrocytes? 3) |
Produce myelin sheath to axons oligodendrocytes - found in CNS, can myelinate many axons Schwann cells - found in PNS, myelinate only 1 axon (needed for faster transmission) |
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What are the functions of astrocyctes? (4) |
- provide nourishment to neurons (glucose & oxygen) - provide support - phagocytosis - chemical composition maintenance |
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What are the function of microglial? |
(immune system) - scavangers |
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What are the function of ependymal cells? |
Make barriers between compartments |
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What is the blood-brain barrier? |
The blood vessels in the brain are normally semi-permiable to allow certain nutrients to pass through (specific chemical composition) |
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What is the area postrema? |
The barrier in the MEDULLA is weaker, to allow toxins to pass through and stimulate this area to allow vomiting |
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What is the order of a withdrawal reflex? |
Sensory neuron interneuron motor neuron effector muscle |
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What are inhibition reflexes? |
sensory neuron interneuron INHIBITION of the neuron from brain telling you not to 'let go of hot plate' motor neuron ...do not let go |
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What is a inotropic channel? |
Ligand-gated channel which opens directly from binding (nicotonic acetylcholine receptor) |
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What is a metatropic channel? |
Ligand-gated channel, opens from indirect binding (e.g. GCPR, muscarinic receptors) |
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What is EPSP? What ion causes it? |
Excitatory post synaptic potential -> caused by influx of Na ions = depolarization |
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What is IPSP? What ions causes it? |
Inhibitory post synaptic potentials K+ moves out of cell (hyperpolarisation) Cl- move into cell (hyperpolarisation) |
