Difference between revisions of "Positive Feedback - Anatomy & Physiology"
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The hormone [[Pituitary Gland - Anatomy & Physiology#Oxytocin|'''Oxytocin''']] causes uterine contraction. During parturition, the uterus stretches. The stretch causes nerve impulses to send signals to the hypothalamus, increasing the oxytocin levels released. This in turn increases uterine contraction, and the cycle continues. | The hormone [[Pituitary Gland - Anatomy & Physiology#Oxytocin|'''Oxytocin''']] causes uterine contraction. During parturition, the uterus stretches. The stretch causes nerve impulses to send signals to the hypothalamus, increasing the oxytocin levels released. This in turn increases uterine contraction, and the cycle continues. | ||
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Revision as of 11:45, 31 August 2010
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Positive Feedback
Positive feedback systems are rare. They occur when secretion of a hormone increases in response to feedback from an organ, creating an amplification process.
Example
The hormone Oxytocin causes uterine contraction. During parturition, the uterus stretches. The stretch causes nerve impulses to send signals to the hypothalamus, increasing the oxytocin levels released. This in turn increases uterine contraction, and the cycle continues.