<prompt> Positive feedback is seen in AE :LH SurgeEntry of Ca into sarcoplasmic reticulumStimulation of gastric secretion of histamine gastrin.Thrombolytic activity in coagulation cascade.  <response>: Ans. is c Stimulation of gastric secretion by histamine and gastrin Most control systems of the body are negative feed back systems. Release of acid in the stomach by the action of gastrin is one of them. Gastrin increase the secretion of gastric acid, but acid then feed backs to inhibit further gastrin secretion.Positive feedback systems in our bodyShockParturition Birth of babyAction potentialBlood clottingLH surge during ovulationEntry of calcium into sarcoplasmic reticulum 