UNC-Chapel Hill EXSS 276 - EXAM 3 REVIEW (18 pages)

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EXAM 3 REVIEW



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EXAM 3 REVIEW

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Pages:
18
School:
University of North Carolina at Chapel Hill
Course:
Exss 276 - Human Physiology
Human Physiology Documents

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EXAM 3 REVIEW Chapter 12 Nervous Tissue o Nervous System Cells o Neurons nerve cells conduct electrical signals action potential Neurogilia provide support to neurons Make up about volume of CNS Astrocytes of CNS star shaped cells largest and most numerous of neuroglia Oligondedrocytes of CNS smaller and contain fewer processes compared to astrocytes o Responsible for forming and maintain the myelin sheath around CNS axon Shwann Cells of PNS myelinates a single axon participate in axon regeneration Neurons have excitable tissue cause a change in voltage to become either more positive or negative Fast process Short duration and specific Parts of neuron Dendrites receive input Axon carries impulse action potential Cell body basic functions of neuron Axon hillock sums graded potentials Axon terminal forms synapse and releases neurotransmitters o Myelination o Function to speed up operation o Sheath consists of fat and protein covering o Node of Ranvier gaps in myelin sheath What allow action potential to move along axon propagate speed o types that produce myelin sheaths Schwann cells in PNS Oligodendrocytes in CNS o White vs Grey Matter o White Composed primarily of myelinated axons Whitish color To try to help secrete linkage from one to another Conduction Brain and spinal cord are highly myelinated Speed fast Provides link between areas region o Grey Contains neuronal cell bodies dendrites unmyelinated axons axon terminals and neuroglia Grey because the Nissl bodies impart appears gray color and there is little or no myelin in the areas Neural processing Analysis Interpretation Higher order of thinking o Blood brain barrier o Barrier around the brain that controls permeability of different substances Very selective o To transport glucose for neuron tissue keep drugs out as well as pathogens o Astrocytes help form blood brain barrier o To get through blood brain barrier Fat soluble materials O2 CO2 C2H5OH free diffusion Glucose active transport Water soluble



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