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A Insect Question

  1. Apr 2, 2007 #1
    How is it possible for insects to survive after they've had their head removed?
     
  2. jcsd
  3. Apr 2, 2007 #2

    jim mcnamara

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    Short answer - the insect brain doesn't control body functions the way it does in mammals, for instance. Insects don't have an autonomic nervous system. Breathing in insects is passive - they have spiracles (holes) in the exoskeleton to allow air exchange for the body tissues.

    Humans- heartbeat and breathing are under control of the brain. Remove the brain and breathing and heartbeat go away. Periplaneta spp. (cockroaches) can live for days without a head.
     
  4. Apr 2, 2007 #3
    My understanding was that heart muscle, being myogenic, is not controlled by the brain and heart rate can keep at a steady pace -- even outside the body (if provided with oxygen etc.) . I hope I didn't misunderstand since this is one of my favorite useless-facts to bring up when a conversation goes awkward and silent and there's nothing to talk about :smile:
     
  5. Apr 3, 2007 #4

    jim mcnamara

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    Read about the parasympathetic effects on the heart of the vagus nerve:

    http://en.wikipedia.org/wiki/Vagus_nerve

    Most things in Biology are not absolute statements- it is possible to keep heart tissues alive and well outside the body.
     
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