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KEY CONCEPT Systems interact to maintain homeostasis.

KEY CONCEPT Systems interact to maintain homeostasis. . 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. UV light. 1. Skin absorbs UV light. 2. Liver produces inactive vitamin D.

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KEY CONCEPT Systems interact to maintain homeostasis.

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  1. KEY CONCEPT Systems interact to maintain homeostasis.

  2. 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.

  3. UV light 1 Skin absorbs UV light 2 Liver produces inactive vitamin D 3 4 Kidneys produce active vitamin D Active vitamin D used in bones • 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.

  4. A disruption of homeostasis can be harmful. • Homeostasis can be disrupted for several reasons. • sensors fail • targets do not receive messages • injury • illness

  5. pancreas 1 Pancreas cells attacked;insulin declines fats 2 Blood glucose levels rise, kidneys 3 4 Body burns fat; blood more acidic, Cells impaired; all organs damaged. • Long-term disruptions can cause more damage. • Diabetes is a serious long-term disruption of homeostasis. • Short-term disruption usually causes little or no harm.

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