Transcript Document

Section 29-1
“How Organs
Communicate”
Write everything that is
underlined
29.1 How Organ Systems Communicate
KEY CONCEPT
The nervous system and the endocrine system
provide the means by which organ systems
communicate.
29.1 How 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
29.1 How Organ Systems Communicate
I. Communication in the body
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!
29.1 How Organ Systems Communicate
a. How your body communicates:
1. A stimulus causes a response
• Responses can be chemical, cellular, or
behavioral
2. The nervous and endocrine systems
respond to stimuli
• Example:
– Stimulus = Cold weather
– Response = Shivering
29.1 How Organ Systems Communicate
3. The nervous
system controls
thoughts,
movement, and
emotion
4. The endocrine
system controls
growth,
development, and
digestion
29.1 How Organ Systems Communicate
II. Different methods 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 nerves
peripheral nervous system
(PNS)
spinal
chord
29.1 How Organ Systems Communicate
• The endocrine system works more slowly
– only chemical signals
– signals move through bloodstream
– physically unconnected organs
target cell
hormone
bloodstream
receptor
not a target cel