Chapter 12 HW A&P - Mills

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Nuclei

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33 Terms

1

Nuclei

collections of nerve cell bodies in the CNS

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2

Ganglia

collection of nerve cell bodies outside of the CNS

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3

Cardiac Muscle

effector of the autonomic nervous system

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4

effector neurons

from CNS to the effectors

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5

CNS myelin sheath

oligodendrocytes

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6

astrocytes

between capillaries and neurons

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7

somatic NS

voluntary regulation

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8

monitoring of GI tract contractions

enteric nervous system

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9

nissl bodies

rough ER at the nerve cell body

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10

synaptic vesicles

storage of neurotransmitters

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11

one

number of axons leaving nerve cell body

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12

trigger zone

location for initiating an axonal impulse

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13

schwann cells

myelin sheath in the PNS

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14

nodes of raniver

gaps in the myelin sheath

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15

axon

conducts impulse away from nerve cell body

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16

afferent nerves

sensory neurons

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17

absolute refractory period

a second impulse cannot be initiated

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18

depolarization

sodium ions float into cell

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19

rapid impulse conduction

function of myelin sheath

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20

repolarization

potassium ions flow from cell

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21

neurotransmitter

bind to receptors on post-synaptic cell

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22

hyperpolarization

membrane potential (-70mV —> -80mV)

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23

excitory neurotransmitter

membrane potential (-70mV —> -60mV)

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24

agonist

enhances ation of neurotransmitter

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25

glutamate

excitatory CNS neurotransmitter

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26

parkinson’s disease

degeneration of dopamine axons/cells

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27

Wallerian degeneration

loss of distal end of severed neuron

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28

chemically activated ion channels

neurotransmitters

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29

Na+, K+, ATPase

ion balance inside and outside of cell

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30

membrane threshold at synapse

activates voltage gated channels (Na+&K+etc)

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31

Membrane polarity maintenance

K+& Na+ leak channels

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32

Agonist

Binds to receptor and turns it on

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33

Antagonist

Turns off the receptor

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