Homeostasis
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
Homeostatic mechanisms are designed to reestablish homeostasis when there is an imbalance.
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.
There are three 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.
There are three components to a homeostatic system:
1. The Sensor which detects the stress.
2. The Control Center which receives information from the sensor and sends a message to adjust the stress.
3. The Effector which receives the message from the control center and produces the response which reestablishes homeostasis It should be noticed that
1. the heat produced by the furnace shuts the furnace down through the thermostat.
2. the original stress is reduced, i.e., the room warms up.
Homeostatic mechanisms that show these two characteristics are operating by negative feedback
Homeostatic Regulation of Body Temperature through
Negative Feedback
Hyperthermia
Stress
Heat receptors in the skin
Stress is reduced shutting down mechanism Perspiration evaporates cooling the skin
Effect
Hypothalamus
Control Center
Sensors
Increased activity of sweat glands
Increased blood flow to the skin
Effectors
Homeostasis Using a Neural
Pathway
Control center
Many homeostatic mechanisms use a nerve pathway in which to produce their effects.
These pathways involve an
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
Homeostatic mechanisms are designed to reestablish homeostasis when there is an imbalance.
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.
There are three 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.
There are three components to a homeostatic system:
1. The Sensor which detects the stress.
2. The Control Center which receives information from the sensor and sends a message to adjust the stress.
3. The Effector which receives the message from the control center and produces the response which reestablishes homeostasis It should be noticed that
1. the heat produced by the furnace shuts the furnace down through the thermostat.
2. the original stress is reduced, i.e., the room warms up.
Homeostatic mechanisms that show these two characteristics are operating by negative feedback
Homeostatic Regulation of Body Temperature through
Negative Feedback
Hyperthermia
Stress
Heat receptors in the skin
Stress is reduced shutting down mechanism Perspiration evaporates cooling the skin
Effect
Hypothalamus
Control Center
Sensors
Increased activity of sweat glands
Increased blood flow to the skin
Effectors
Homeostasis Using a Neural
Pathway
Control center
Many homeostatic mechanisms use a nerve pathway in which to produce their effects.
These pathways involve an