Positive feedback is seen in A/E :

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 bodyShock*Parturition (Birth of baby)*Action potential*Blood clotting*LH surge during ovulation*Entry of calcium into sarcoplasmic reticulum*