CNS Quiz Answers

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terest 11, How neurons communicate with other cells 1 to attract other electrical charges 2 leakage channels, voltage gated channel, ligand gated channel 3 only works for the ions LiceIC+ 4 action potential, graded potential 5 it will stop exchanging 6 it will decrease 7 they are sustained 8 cell membrane 9 voltages 12. All or none principle An action potential takes place in 2 phases: Depolarization: inside the membrane becomes + Repolarization : inside becomes more – Na+ and k+ are ions that move through the membrane via ion channels and change the electrical charge of the neuron - when NA+ channels open, NA+ moves inside= depolarization - When K+ channels open, K+ moves out + repolarization - When depolarization…show more content…
ch 12 review 1 what are the components of the CNS? The PNS? - CNS consists of the brain and spinal Cordially, PNS consists of all other nervous tissue 2 what is difference between afferent neurons and efferent neurons? Which one is associated with sensory neurons? With motor neurons? - afferent = sensory information move toward the brain and spinal cord -efferent= information is taken away from the brain and spinal Cord 3 what is function of interneurons? - contact nearby neurons in brain, spinal cord or ganglion 4 what are subdivisions of the PNS? - the subdivisions of the PNS are somatic nervous system, autonomic nervous system and enteric nervous…show more content…
SNS-motor portion under voluntary control ANS-motor portion under involuntary control 6 what are the functions of the dendrites and the cell body of a neuron? -dendrites collect signals the cell body of a neuron lacks centrioles 7 which neuroglia are CNS and PNS ? functions? - astrocyes- CNS-maintain chemical environment , support and nourish oligodendrocyes-produce myelin sheath around adjacent azons microglia-migrating phagocytes ependymal cells-form and circulate cerebrospinal fluid PNS Satellite cells-support cells within PNS ganglia Schwann cells- produce myelin sheath around axons 8. function of myelin? Which neuroglia produce myelin? Accelarates impulse through axon 9. what are the main difference between graded potentials and action potentials? -Granded potentials are first response of a neuron to stimulation Action potential is rapid electrical event occurring in phases which are the depolarizing phase and the repolarizing phase 10. what are 4 types of ion channels? Leakage, voltage-gated /ligand-gated/mechanically gated channel 11what are two phases of an action potential? –depolarization and
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