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

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.

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

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

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!

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

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

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

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