1. Homeostasis A condition in which the internal environment of the body remains relatively constant despite changes in the external environment. Examples would be the maintenance of body temperature and levels of glucose in the blood

2. A negative feedback control system responds when conditions change from the ideal or set point and returns conditions to this set point. There is a continuous cycle of events in negative feedback. Homeostasis in animals relies largely on negative feedback systems.

3. 3 Componenets to a System

4. 3 components to this system: 1.The Sensor which detects the stress. 2.The Control Center which receives information from the sensor and sends a message to the Effector. 3.The Effector which receives the message from the control center and produces the response which reestablishes homeostasis.

5. The Home Heating System 1.When the temperature of a room decreases below a set point, the thermostat electrically starts the furnace. 2.As the temperature of the room rises to the set point, the thermostat shuts down the furnace. 3.As the room cools, step one is repeated.

8. Control of the pH in the Duoenum

9. Control of Blood Glucose Levels

11. ADH and Water Balance

12. 1. What are the benefits of a negative feedback response? In what direction does a variable change as a result of a negative feedback response to a stress? 4. What is homeostasis failure? What has happened with this occurs?