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5 Written questions

5 Matching questions

  1. autonomic nervous system
  2. graded potentials
  3. other neurotransmitters
  4. nerve regeneration in CNS
  5. neuromuscular junction
  1. a synapse between neuron and muscle
  2. b also, local potentials

    -changes in transmembrane potential that cannot spread far from site of stimulation
    -any stimulus that opens a gated channel; produces a graded potential
  3. c -limited by chemicals released by astrocytes that
    -block growth
    -produce scar tissue
  4. d other than acetylcholine

    norepinephrine (NE) - released by adrenergic synapses; excitatory and depolarizing effect; widely distributed in brain and portions of ANS

    dopamine - a CNS neurotransmitter; may be excitatory or inhibitory

    serotonin - a CNS neurotransmitter; affects attention and emotional states

    gamma aminobutyric acid - GABA; inhibitory effect; functions in the CNS
  5. e -controls contractions of smooth muscle, cardiac muscle, and glandular secretions
    -sympathetic division
    -parasympathetic division

5 Multiple choice questions

  1. resting potential - transmembrane portential of resting cell
    graded potential - temporary, localized change in resting potential
    action potential - electrical impulse; produces by graded potential; propagates along surface of axon to synapse
    synaptic activity - releases neurotransmitters at presynaptic membrane; produces graded potentials in postsynaptic membrane
    information processing - response (integration of stimuli) of postsynaptic cell
  2. presynaptic cell - neuron that sends message
    postsynaptic cell - cell that receives message
    synaptic cleft - small gap that separates the presynaptic membrane and the postsynaptic membrane
  3. -myelinated
    -medium diameter
    -medium speed
    -carry intermediate signals
    -e.g. sensory information, peripheral effectors
  4. refractory period -

    absolute refractory period -
    -sodium channels open or inactivated
    -no action potential possible; gates locked closed

    relative refractory period -
    -membrane potential almost normal
    -resistant to opening but w/ large stimulus can open
  5. continuous propagation - unmyelinated axons

    saltatory propagation - myelinated axons

5 True/False questions

  1. interneurons-cells that provide brain power
    -most located in brain, spinal cord, autonomic ganglia
    -between sensory and motor neurons


  2. neurogliacells that send and receive signals


  3. oligodendrocytes-processes contact other neuron cell bodies
    -wrap around axons to form myelin sheaths


  4. organs of nervous system-controls contractions of smooth muscle, cardiac muscle, and glandular secretions
    -sympathetic division
    -parasympathetic division


  5. transmembrane potential-differing ionic concentrations between cytosol and extracellular fluid
    -selectively permeable membrane
    -transport mechanisms