28.3 Interactions Among Systems

KEY CONCEPT Systems interact to maintain homeostasis.

28.3 Interactions Among Systems

I can describe the interaction between organ systems in terms of homeostasis.

I can describe the effect of disruption of 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.– Organ systems work together to produce Vitamin D.– Thermoregulation maintains a steady body temperature.

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Skin absorbs UV light

Liver produces inactive vitamin D

Kidneys produce active vitamin D Active vitamin D used in bones

UV light

28.3 Interactions Among Systems

A disruption of homeostasis can be harmful.

• Homeostasis can be disrupted for several reasons. – sensors fail – targets do not receive messages– injury – 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.

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Pancreas cells attacked;insulin declines

Blood glucose levels rise,

Body burns fat; blood more acidic, Cells impaired; all organs damaged.

pancreas

fats

kidneys