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T or F - The Parasympathetic Division is faster...

Discussion in 'Step I' started by BlondeCookie, May 8, 2007.

  1. BlondeCookie

    BlondeCookie Senior Member 7+ Year Member

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    Jul 4, 2005
    True or False:
    The preganglionic & postganglionic fibers of the Parasympathetic Division is faster is overall conduction speed than the Sympathetic Division.

    *Note: This isn't an actual question from a review book. I made this one up myself because I'm trying to get better understanding of some topics. Sorry, if it is worded incorrectly.
     
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  3. Red Beard

    Red Beard 7+ Year Member

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    Apr 25, 2006
    True, because the post-ganglionic sympathetics are mostly unmyelinated and will exhibit a slower conduction speed.
     
  4. nockamura

    nockamura Senior Member 10+ Year Member

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    Sep 10, 2004
    Yeah, but the question says, "preganglionic & postganglionic fibers" so something's got to give.
     
  5. SeventhSon

    SeventhSon SIMMER DOWN 7+ Year Member

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    Aug 23, 2005
    San Diego
    MDApps:
    :confused:
     
  6. nockamura

    nockamura Senior Member 10+ Year Member

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    Sep 10, 2004
    Why are you confused? I agree that a portion is true, but whether or not the preganglionics are slower has yet to be proven. Thus the entirety of the statement cannot be asserted as true.
     
  7. SeventhSon

    SeventhSon SIMMER DOWN 7+ Year Member

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    Aug 23, 2005
    San Diego
    MDApps:
    im confused by "so something's got to give".

    What you're saying technically may be right, but our working assumptions would be that neurons with the same caliber, same lipoprotein composition of myelination, same supply of nutrients, and same expression of voltage-sensitive ion channels will have the same conduction velocity. Everything else is a PhDs job.
     
  8. irie

    irie royale with cheese 7+ Year Member

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    Aug 21, 2003
    Which one would you want to be faster, the one that gets you out of the way of the falling anvil or the one that lets you poop?
     

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