Positive feedback is seen in all except: (A) LH surge, (B) Entry of calcium into sarcoplasmic reticulum, (C) Gastric secretion, (D) Thrombus formation
Answer is C. Ans. (c) Gastric secretion(Ref: Guyton, 13th ed/p.7)Gastric secretion is an example for a negative feedbackIncrease in levels of gastric acid inhibits its own productionPositive feedback - once started, it enhances or amplifies the effect on its own. That is why positive feedback is also called VICIOUS CYCLEExamples of positive feedback are, (CLASP)#Clotting#LH surge#Action potential#Shock#Parturition