4.4 Feedback in Cell Communication
in AP Biology
Negative feedback helps to maintain homeostasis. Positive feedback is self-reinforcing and amplifies responses.
To Think About:
What are feedback mechanisms? How does negative feedback maintain homeostasis? How does positive feedback affect homeostasis?
Watch: AP Daily Video Feedback
Answer the Following Questions:
- What are the two main purposes for which organisms use feedback mechanisms?
- Feedback mechanisms are processes used to maintain homeostasis by _______________________________________________________
- Negative feedback mechanisms maintain ___________________ by returning the system back to its ____________________________
- Explain one example of negative feedback (they do not give one in the video, so you may need to research this on your own)
- Positive feedback mechanisms ___________________ responses and processes.
- Explain one example of positive feedback.
- Explain how your body would respond to decreased oxygen levels at a high elevation.
Supplementary Resources:
- Bozeman Science: Mr. Andersen’s “Positive and Negative Feedback Loops” video
- TED-ED: Feedback Loops
