<prompt> Which of the following is an example of feedforward mechanism?Increase blood pressure during supine postureSalivation on smelling foodShivering on exposure to cold environmentNone of the above  <response>: Ans. c Shivering on exposure to cold environmentRef: Ganongs Review of Medical Physiology 25th Ed; Page No- 249 Thermoreceptors are located within the body central Thermoreceptors as well as in the skin surface peripheral thermoreceptor. Thermoreceptors within body function as conventional feedback sensor. If the CORE body temperature drops back to 37degC set point. In contrast, thermoreceptors in the skin function as feed-forward sensor. How? Decreases in environmental temperature are rapidly sensed by skin thermoreceptors, and compensatory thermoregulatory responses are initiated before there is any appreciable fall in CORE body temperature. Other example of feed-forward system: Increased Heart rate and respiratory rate even before the start of exercise due to psychic stimulation. Some rapid movement of body parts occurs so rapidly that there is not enough time for feedback control slow. Thus brain controls these movements by feed-forward system.Extra MileThermoreceptorsReceptorsNerve fibers typeDetectsCool receptorsAdSkin cooling 25degCWarm receptorsCSkin warming 35degCHeat nociceptorsAdHot temperature 45degCCold nociceptorsCCold temperature 5degC 