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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