1. KEY CONCEPT Body systems interact to maintain homeostasis.

2. Each organ system affects other organ systems.
Organ systems must work together to keep the organism healthy.

3. Example: Organ systems work together to produce Vitamin D.
Organ systems work together to keep the organism healthy and maintain homeostasis.
Example: Organ systems work together to produce Vitamin D. 1 2 3 4
Skin absorbs UV light
Liver produces inactive vitamin D
Kidneys produce active vitamin D
Active vitamin D used in bones
UV light

4. Example: the nervous system and circulatory system cooperate to maintain body temperature.

5. A disruption of homeostasis can be harmful.
Short-term disruption usually causes little or no harm
Long-term disruptions can cause more damage.
Ex: diabetes is a serious long-term disruption of homeostasis. 1 2 3 4
Pancreas cells fail to make insulin
Blood glucose levels rise,
Body burns fat; blood more acidic,
Cells impaired; all organs damaged.
pancreas
fats
kidneys