Explain how a negative feedback mechanism differs from a positive feedback mechanism.

1. The skin is the major organ of the _____________ system.  The top layer of the skin is called the ______________. (2 pts)
2. What organs are part of the nervous system? What does the system do for the body?
3. Which organ system consists of glands that secrete hormones into the bloodstream?
4. List 3 organs found in the abdominal cavity.
5. Explain how a negative feedback mechanism differs from a positive feedback mechanism.

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