1. KEY CONCEPT The nervous system and the endocrine system provide the means by which organ systems communicate.

2. The body’s communication systems help maintain homeostasis.
A stimulus causes a response.
Responses can be chemical, cellular, or behavioral.
The nervous and endocrine systems respond to stimuli.

3. The nervous system controls thoughts, movement, and emotion.
The endocrine system controls growth, development, and digestion.

4. interconnected network of cells signals move through cells
The nervous and endocrine systems have different methods and rates of communication.
The nervous system works quickly, using chemical and electrical signals.
interconnected network of cells
signals move through cells
divided into central nervous system (CNS) and peripheral nervous system (PNS)
spinal chord
nerves

5. The endocrine system works more slowly.
only chemical signals
signals move through bloodstream
physically unconnected organs
target cell
hormone
bloodstream
receptor
not a target cell