Homeostatic ControlHESI A2 cheat sheet

Detect, compare, respond

8 key facts 5 practice questions Reviewed Oct 2026

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The Components

Receptor detects the change
Control center compares it with the set point
Effector carries out the response

Negative Feedback

Reverses the change — the dominant mechanism
Temperature, glucose, blood pressure

Positive Feedback

Amplifies the change until an endpoint
Childbirth, clotting

Failure

When control fails, values drift out of range — the basis of disease

Key takeaway

Detect, compare, respond

Before you read

Test yourself first: 5 questions

Question 1 of 5

Homeostasis is most often maintained by:

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