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Feedback Loops: Positive Feedback quiz

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  • How is the birth of a baby/labor a positive feedback loop?
    The birth of a baby is a positive feedback loop because pressure on the cervix from the baby's head signals the hypothalamus to release oxytocin, leading to uterine contractions, increased pressure on the cervix, and more oxytocin release, intensifying labor until the baby is born.
  • What is an example of a positive feedback loop in biological systems?
    Blood clotting.
  • What is true of positive feedback mechanisms?
    They are less common than negative feedback mechanisms.
  • How does positive feedback control affect homeostasis?
    It amplifies changes and moves the system away from equilibrium.
  • What is the purpose of positive feedback?
    The purpose of positive feedback is to amplify the body's response to a stimulus, moving further from the set point, and is crucial for certain biological processes like childbirth and blood clotting.
  • What is an example of a positive feedback mechanism?
    Blood clotting after a vessel injury.
  • Why is birthing a baby an example of positive feedback?
    Birthing a baby is an example of positive feedback because the process involves increasing uterine contractions due to oxytocin release, which further increases pressure on the cervix, leading to more oxytocin release until the baby is born.
  • Uterine contractions of childbirth are an example of which type of feedback loop?
    Uterine contractions of childbirth are an example of a positive feedback loop.
  • What is the best example of a social reinforcer?
    Praise from a teacher.
  • Which hormone is controlled by positive feedback?
    Oxytocin.
  • Which hormone is regulated by a positive feedback mechanism?
    Oxytocin.
  • Which option describes a positive feedback mechanism? A) A process that reduces the effects of a stimulus. B) A process that amplifies the effects of a stimulus. C) A process that maintains homeostasis. D) A process that decreases the intensity of a stimulus.
    B) A process that amplifies the effects of a stimulus.
  • What does a positive Chvostek's sign indicate?
    A positive Chvostek's sign indicates neuromuscular irritability, often associated with hypocalcemia.
  • How is childbirth an example of a positive feedback loop?
    Childbirth is an example of a positive feedback loop because the pressure on the cervix from the baby's head triggers oxytocin release, leading to stronger uterine contractions, which further increase pressure on the cervix, continuing the cycle until the baby is born.