Feedback loop

Definition

A feedback loop is a biological system where the output of a process influences the operation of the process itself. It can be either positive, amplifying changes, or negative, reducing changes to maintain stability.

5 Must Know Facts For Your Next Test

1. Feedback loops are essential for maintaining homeostasis in physiological systems.
2. Negative feedback loops work to counteract deviations from a set point, promoting stability.
3. Positive feedback loops amplify changes and are less common than negative feedback loops in homeostasis.
4. The hypothalamus plays a key role in many bodily feedback loops, such as temperature regulation.
5. Hormonal regulation often involves complex feedback loops to balance levels within the body.

Review Questions

• What is the primary difference between a positive and negative feedback loop?
• How does a negative feedback loop contribute to homeostasis?
• Provide an example of a physiological process that uses a feedback loop.

Related terms

Homeostasis:

The body's ability to maintain stable internal conditions despite external changes.

Set Point:

The target value for a physiological state that the body tries to maintain through feedback mechanisms.

Hypothalamus:

A brain region controlling several homeostatic processes including temperature regulation and hormone release.