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KEY CONCEPT Systems interact to maintain homeostasis.

KEY CONCEPT Systems interact to maintain homeostasis. DEFINE THESE TERMS (page 858). Homeostasis- Feedback- Negative feedback- Positive feedback- Thermoregulation-. Each organ system affects other organ systems. An organ system must do a specific job.

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KEY CONCEPT Systems interact to maintain homeostasis.

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  1. KEY CONCEPT Systems interact to maintain homeostasis.

  2. DEFINE THESE TERMS (page 858) • Homeostasis- • Feedback- • Negative feedback- • Positive feedback- • Thermoregulation-

  3. 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.

  4. 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. • Skin-absorbs UV light to make inactive Vitamin D • Liver-changes inactive D into another compound • Kidneys-convert this D into active Vitamin D.

  5. Thermoregulation maintains a steady body temperature • Page-863

  6. 6.Short term • 7.little lasting damage • 8.common cold • 9.long term • 11.Diabetes

  7. A disruption of homeostasis can be harmful. • Homeostasis can be disrupted for several reasons. • sensors fail to detect signals • targets do not receive messages • Serious injury • illness • Viruses or bacteria change internal chemistry

  8. 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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