question: Q:The endocrine system maintains homeostasis using many feedback mechanisms. Which of the following is an example of positive feedback?? 
  A:Infant suckling causes a mother's brain to release oxytocin, which in turn stimulates milk production.;B:An enzyme is allosterically inhibited by the product of the reaction it catalyzes.;C:When ATP is abundant the rate of glycolysis decreases.;D:When blood sugar levels decrease to normal after a meal, insulin is no longer secreted.