GED® Science: Homeostasis & Life Science Data (Deep Dive) › 1. Homeostasis & Feedback Loops
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1. Homeostasis & Feedback Loops

GED® Science: Homeostasis & Life Science Data (Deep Dive) · preview lesson

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Homeostasis is the process of keeping the body's internal conditions within a healthy range, even when the outside world changes. Body temperature, blood sugar, water balance, oxygen level, and pH all need to be regulated. These conditions don't stay perfectly fixed — they fluctuate around a normal set point.

Negative Feedback Keeps You Balanced 1. Condition leaves normal (e.g., body gets too hot) 2. Sensor detects it sends to control center 3. Effector responds (e.g., you sweat) 4. Back to normal change is reversed 'Negative' feedback means the response REVERSES the change, pushing the body back toward its set point.
A feedback loop: a change is detected by a sensor, a control center responds through an effector, and the change is reversed back toward normal.

Homeostasis works through feedback loops with three parts:

  • A sensor (receptor) detects a change.
  • A control center compares the change to the set point.
  • An effector carries out a response.

Most homeostasis uses negative feedback, meaning the response reverses the original change. If you get too hot, you sweat to cool down; if you get too cold, you shiver to warm up. Both responses push the body back toward normal.

⚠️ Common misconception: 'negative feedback' is not 'bad' feedback. It is called negative because the response works against the change, returning the body toward its set point.

💡 Tip: homeostasis is the body fighting change to stay near normal — detect, respond, reverse.

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