Feed forward mechanism..

Feed forward mechanism Feedback mechanism Controller anticipates changes & takes a desired action. No time lag present Examples: - Cephalic phase of gastric acid secretion Increase ventilatory drive in exercise. Change occur in controlled variable & that change is feedback to controller & then the controller takes action Time lag is present. Type: Negative feed back - Kidney body fluid mechanism - Temperature regulation - Baroreceptor mechanism Positive feed back - Circulatory shock - Oxytocin in paurition - Platelet plug / clot formation - LH surge leading to ovulation - Bladder filling to micturition