Phys Ch10,11 Exam2

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bkheath
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109917
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Phys Ch10,11 Exam2
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2011-10-18 13:44:54
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Phys Ch10 11 Exam2
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Phys Ch10,11 Exam2
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  1. Conversion of stimulus energy into electrical energy; chg in mem potential in response to a stimulus acting on a sensory receptor by opening or closing ion channels
    Transduction
  2. Components of a sensory unit
    • Single afferent neuron, plus all receptors associated w/it (at PNS) (receptive field)
    • Sensory receptors--> axon--> cell body--> axon--> axon terminals in CNS
  3. Decrease in amplitude of receptor potential over time in presence of constant stimulus which causes decrease in frequency of action potentials (decreases perception of a stimulus)
    Adaptation
  4. What is primary function of autonomic nervous system?
    What are it's 2 branches?
    Is it afferent or efferent branch of nervous system?
    • Regulate organs to maintain homeostatis
    • Parasympathetic and sympathetic nervous system
  5. The ___ nervous system is "rest and digest" state; increased GI activities; decrease bp & hr
    parasympathetic
  6. The ___ nervous system is "fight or flight" state; mobilizes energy stores; decrease GI function
    sympathetic
  7. Most effector organs are innervated by _____ ANS
    both parasympathetic and sympathetic
  8. Primary NT of parasympathetic nervous system
    acetylcholine
  9. Primary NT of sympathetic nervous system
    norepinephrine
  10. How many neurons are involved in the autonomic pathway b/w CNS and organs to which it effects? (effector organs)
    2 (pre- and postganglionic neuron meet at autonomic ganglion)
  11. Preganglionic neuron is ___ and postganglionic neuron is ___.
    (cholinergic or adrenergic)
    • Cholinergic
    • Adrenergic
  12. Axon swellings which contain stored NTs
    Varicosities
  13. Synpase b/w postganglionic neuron and effector organ
    Neuroeffector junction
  14. Diff b/w process of releasing NTs normally in a synapse, and at neuroeffector junctions
    At neuroeffector junctions, the action potential which caused start of process (voltage-gated Ca channels opening, etc etc) travels on to the next varicosity
  15. Somatic Nervous System:
    Organ controlled?
    Voluntary or involuntary control?
    Neurotransmitter?
    Neurotransmitter receptor?
    Number of neurons in pathway & where
    pathway runs?
    • Skeletal muscle
    • Voluntary
    • Acetylcholine
    • Nicotinic cholinergic in skeletal muscle
    • One; spinal cord --> muscle
  16. One motor neuron plus all of the muscle fibers it innervates
    Motor unit
  17. Does one neuron innervate multiple muscle
    fibers?

    Does one muscle fiber have multiple neurons
    innervating it?
    Yes

    No; each mucle fiber is innervated by only one motor neuron
  18. Synapse b/w a motor neuron and a muscle fiber
    Neuromuscular Junction

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