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Cytology of the Nervous System

Quiz by OASIS

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16 questions
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  • Q1
    Which neuroglial cells myelinate axons in the CNS?
    Ependymal cells
    Schwann cells
    Oliodendrocytes
    Astrocytes
    30s
  • Q2
    Which of the following is not true of the perikaryon?
    Can have direct synaptic connections with other neurons
    Contain the cell nucleus
    Can be stained with dyes that bind nucleic acids
    They have a small amount of rough endoplasmic reticulum
    30s
  • Q3
    Where in the receptor zone of the neuron is all received electrical input averaged together to potentially produce an action potential?
    Cell nucleus
    Initial segment
    Axon hillock
    Soma
    30s
  • Q4
    The larger the diameter of an axon, the faster the signal conduction.
    TRUE
    FALSE
    30s
  • Q5
    All of the following is true of nodes of Ranvier except:
    They are myelinated
    They are separated in regular intervals on the axon.
    They have many ion channels involved in action potential conduction
    They are areas of depolarization
    30s
  • Q6
    What can you assume from an axon that is not myelinated
    Axon conduction velocity will be faster
    Axon conduction velocity will be slower
    The action potential will now “jump” across the axon
    Nothing, conduction will be the same
    30s
  • Q7
    Which two cells are responsible to regulating the extracellular synaptic environment in the central nervous system?
    Oligodendrocytes and ependymal cells
    Schwann and satellite cells
    Astrocytes and oligodendrocytes
    Astrocytes and satellite cells
    30s
  • Q8
    All of the following are examples of astrocyte functions except:
    Assist in the migration of neurons to their appropriate locations during development
    Contribute to the blood brain barrier
    Assist in neurotransmitter recycling
    They help return potassium to the extracellular environment
    30s
  • Q9
    What type of cell moves between the peripheral nervous system and central nervous system to assist in injury or infection?
    Astrocytes
    Microglial cells
    Satellite cells
    Peripheral macrophages
    30s
  • Q10
    How are astrocytes connected to one another?
    Tight junctions
    Desmosomes
    Adherens junctions
    Gap junctions
    30s
  • Q11
    Sensory neurons that bring information from the body into the spinal cord are commonly what type or neuron?
    Pseudounipolar
    Multipolar
    Unipolar
    Bipolar
    30s
  • Q12
    Olfactory epithelial cells are an example of what type of neuron?
    Pseudounipolar
    Unipolar
    Bipolar
    Multipolar
    30s
  • Q13
    The averaging of graded potentials occurs in which area of the neuron?
    Dendrites
    Terminal end
    Axon Hillock
    Initial Segment
    30s
  • Q14
    An autoimmune disease that causes demyelination may yield all of the following EXCEPT which?
    Inability to fire an action potential
    Decline in the control of ionic environment of the axon
    Inhibition of saltatory conduction
    Decreased in conduction velocity
    30s
  • Q15
    Which of the following is NOT a function of astrocytes?
    Scavenge for Na+ in the extracellular environment
    Help form the blood brain barrier
    Supply nutrients to neurons from circulation
    Inactivate neurotransmitters in the synaptic cleft
    30s

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