Bio 220 - Chapter 6 - Communication, Integration, and Homeostasis

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cbennett
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197772
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Bio 220 - Chapter 6 - Communication, Integration, and Homeostasis
Updated:
2013-02-04 01:47:31
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Bio 220 Chapter
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Bio 220 - Chapter 6
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  1. The most rapid intracellular responses to signals result from activation of receptors that are also...
    ion channels
  2. The ion that controls the widest variet of intracellular activities is
    calcium
  3. Signal molecules that degrade most rapidly, resulting in very brief effects, are
    gases such as nitric oxide
  4. The neurotransmitter norepinephrine ____
    causes some blood vessels to dilate and others to constrict, because different vessels have different receptors for norepinephrine.
  5. Compared to endocrine reflexes, neural reflexes ______
    respond rapidly but are very brief
  6. Cells that respond to signals are usually called
    targets
  7. Why do some normal cells fail to respond to a chemical signal?
    some cells lack the necessary receptors.
  8. Receptor molecules are located in the:
    • cytosol
    • nucleus
    • outer cell membrane
  9. Lipophilic hormones bind to receptors
    inside the cytoplasm or nucleus
  10. This messenger:
    changes the regulation of ion channels
    increases intracellular Ca+ concentration
    changes enzyme activity
    Second messenger
  11. Evaluates incoming signals and compares it with the setpoint
    Integrating center
  12. Stabilizes the variable being regulated
    negative feedback
  13. membrane-spanning proteins that communicate in gap junctions
    connexins
  14. A chemical that is secreted by a cell to act on cells in its immediate vicinity is called a
    paracrine
  15. If the signal molecule acts on the cell that secreted it, the chemical is called an
    autocrine
  16. target cell inserts more receptors into its membrane
    up-regulation
  17. Signal molecule receptors exhibit
    • specificity
    • competition
    • saturation

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