lec 3-1

  1. Division of NS that carries sensory signals from various receptors to CNS
    sensory/afferent dividison
  2. division of NS that carries signals from receptors in the skin, muscles, bones and joints
    somatic/afferent sensory
  3. division of the NS that signals from the viscera of the throacic and abdoninal cavities
    visceral sensory/afferent dividion
  4. a molecule, cell, or organ that carries out a response to a stimulus, or responds to commands from the CNS
  5. Part of NS that carries signals to skeletal muscles
    somatic/efferent motor division
  6. part of the NS that tends to arouse body for action. Accelerating heart beat and respiration, while inhibiting digestion and urinary system
    Sympathetic NS
  7. Part of the NS that tends to have calming effect, slows heart rate and breathing.  Stimulates digestion and urinary systems
    parasympathetic NS.
  8. ____ is a collection of cell bodies in the CNS:
    -non-mylinated, called gray matter
  9. A___is a collection of nerve fibers in the CNS. Highly organized, mostly axons, mostly myilinated and called white matter
  10. ___ are a collection of cell bodies in the PNS.
  11. 2 nerve cell types
    neuroglia and neurons
  12. 1) If a mature neuron is not in synaptic contact with another neuron it is covered by _____ cells

    2) are neurons or neuroglia more numerous?
    1) glial

    2) neuroglia
  13. Types of neuroglia that occur only in CNS
    • 1) oligodendrocytes
    • 2) ependymal cells
    • 3) microglia
    • 4) astrocytes
  14. types of neuroglia that occur only in PNS
    • 1) schwan cells
    • 2) satellite cells
  15. tumor that grows rapidly and are highly malignant. The blood-brain barrier decreases effectiveness of chemotherapy treatment consists of radiation or surgery
  16. 1)___ is a mass of rapidly dividing cells. 

    2) Can tumors arise from neurons?
    • 1) tumor
    • 2) seldom, because they have little or no capacity formitosis
  17. A____ is a cell that's structure and function is specialized for irritability to stimuli and conduction of impuses.
    -vary in size in parts of the CNS and PNS
  18. 1) ____ is the control center of the neuron

    2) what organelle is a neuron missing? 

    3) primary site for receiving signals from other neurons?

    4) A___ originates from a mound on one side of the soma, and is specialized for rapid conduction of nerve signals.
    • 1) soma or cell body
    • 2) centrioles 
    • 3) dendrites
    • 4) axon (nerve fiber)
  19. ____ is an insulating layer around a nerve fiber that is formed by oligedendrocytes in CNS and schwan cells in PNS.
    myelin sheath
  20. 1)___ are outermost coil of the myelin sheath.
    2)  _____ reach out to myelinate several nerve fibers in it's immediate vicinity
    3) name a disease of the myelin sheeth
    • 1) neurolima
    • 2) oligodendrocytes
    • 3) multiple sclerosis (deterioration of myelin and oligodendrocytes
  21. name this neuron type:
    Image Upload 1
    multipolar neuron
  22. name this type of neuron: 
    Image Upload 2
    bipolar neuron
  23. name this type of neuron:
    Image Upload 3
  24. name this type of neuron:
    Image Upload 4
    anaxonic neuron
  25. 3 functional classes of neurons
    • 1) Sensory: detects stimuli
    • 2) Interneurons: integrative
    • 3) motor: signals out
  26. 1) A__ is a change in electrical potential conducted along the plasma membrane of an action potential (AP)

    2) the speed of an nerve signal depends on __&__
    1) impulse

    2) diameter of fiber & myelin presence
  27. 1) ____ ___period is where no stimulus of any strength will trigger an action potential

    2) ___ __ period is where only especially strong stimuli will trigger a new action potential, because K+ gates are still open and any incoming Na is opposed by outgoing K.
    1) absolute refractory period

    2) relative refractory period
Card Set
lec 3-1
lec 3-1