Positive feed back is seen in A/E :
C i.e. Stimulation of gastric secretion by histamine & gastrinMost control system of the body are negative feed back system. Release of acid in stomach by the action of gastrin is negative feed back system, as Tin acid secretion inhibits fuher gastrin secretion.
LH Surge
Entry of Ca into sarcoplasmic reticulum
Stimulation of gastric secretion of histamine & gastrin
Thrombolytic activity in coagulation cascade