1. Section 29-1 “How Organs Communicate”
Write everything that is BLACK

2. State Standards
As a result of the coordinated structures and functions of organ systems, the internal environment of the human body remains relatively stable (homeostatic) despite changes in the outside environment. As a basis for understanding this concept:
B. Students know how the nervous system mediates communication between different parts of the body and the body's interactions with the environment.

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

4. What does communication mean?
a process by which information is exchanged between individuals through a common system of symbols, signs, or behavior

5. The body’s communication systems help maintain homeostasis – remember that?? Homeostasis is when the body maintains an internal set of conditions to KEEP YOU ALIVE!

6. How your body communicates:
A stimulus causes a response
Responses can be chemical, cellular, or behavioral
The nervous and endocrine systems respond to stimuli
Example:
Stimulus = Cold weather
Response = Shivering

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

8. 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

9. 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