28.3 Interactions Among Systems - Murrieta Valley Unified School District
28.3 Interactions Among Systems
KEY CONCEPT
Systems interact to maintain homeostasis.
28.3 Interactions Among Systems
Each organ system affects other organ systems.
? An organ system must do a specific job.
? Organ systems must also work together to keep the
organism healthy.
28.3 Interactions Among Systems
? Organ systems must also work together to keep the
organism healthy.
¨C Organ systems work together to produce Vitamin D.
¨C Thermoregulation maintains a steady body temperature.
UV light
1
Skin absorbs UV light
2
Liver produces inactive vitamin D
3
Kidneys produce active vitamin D
4
Active vitamin D used in bones
28.3 Interactions Among Systems
A disruption of homeostasis can be harmful.
? Homeostasis can be disrupted for several reasons.
¨C sensors fail
¨C targets do not receive messages
¨C injury
¨C illness
28.3 Interactions Among Systems
? Short-term disruption usually causes little or no harm.
? Long-term disruptions can cause more damage.
? Diabetes is a serious long-term disruption of homeostasis.
pancreas
1
Pancreas cells attacked;insulin
declines
2
Blood glucose levels rise,
fats
kidneys
3
Body burns fat; blood more acidic,
4
Cells impaired; all organs
damaged.
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