Give the procedure to positive feedback mechanism:
 
PositiveFeedback question.jpg
Answer variants:
Uterine muscle contraction.
Stretch of the cervix due to childbirth.
Oxytocinergic neurons in hypothalamus signaled to stop oxytocin secretion.
Oxytocinergic neurons in hypothalamus.
Posterior pituitary secretes oxytocin and releases it into blood.
  
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