1. 4/18/2015 A Model of Control Systems Theory Reference Input : Ideal value or goal state Comparator : Actual - Reference Action System Output : Results of the Systems actions Input : Values related to goal state Sensor : Detect Input Disturbance : Influences from outside the system

2. 4/18/2015 CST and the Themostat Reference Input : Thermostat = 72 o Comparator : 72-65 = -7 Action System: Furnace is turned on Output : Hot air is blown out of vents Input : Air temperature 65 o Sensor : Thermometer at wall Disturbance : e.g. open window

3. 4/18/2015 CST and the Thermostat Reference Input : Thermostat = 72 o Comparator : 72-73 = 1 Action System: Furnace is turned off Output : No hot air Input : Air temperature 73 o Sensor : Thermometer at wall Disturbance : e.g. open window

4. 4/18/2015 Midsagittal Cut

5. 4/18/2015 Bottom of the Brain

6. 4/18/2015 Preoptic Area

7. 4/18/2015 CST and Eating Reference Input : Reference Calories and Fat signal for Weight = 150 Comparator : Structures in Hypothalamus Action System: Controls Metabolism Rate of Burning Fat Output : Signal about fuel level and State of Fat Cells which stimulate hunger Input : Calories Per day Signals from Stomach Signals from Fat Sensors : Brain, stomach others Disturbance : vomiting (Decreases input) Exercise (Increase Metabolism