The need to control and respond

3. INTRODUCTION
-To keep our body within homeostatic condition, several organ
systems must work together and communicate with one another.
Messages must be generated, dilevered, and interpreted and acted
upon by the assigned organ system.
-The two main organ systems responsible for the body’s
communication network are the ENDOCRINE SYSTEM and
NERVOUS SYSTEM.

5. Nervous System is
composed of physically
connected networks of
nerve cells, tissues, and
organs that control your
thoughts, senses, and
movement, as well as
many of your life’s body
functions such as
breathing.

7. Endocrine System is a collection of
physically disconnected glands that also help in
varios body processes such as growth,
development, and conjuring responses to the
environment.

11. Stimulus is defined broadly as
something that can cause or elicit a
response from the organism.
-In living systems, a stimulus usually
trigger a change in an individual,
which may be in the form of
chemical, cellular, or behavioral
responses.

13. Example:
Imagine that a fly
fluttering over to the
banana you are holding.
You quikly and
automatically hover your
hand to keep it from
touching your food.

14. Example:
Imagine that a fly
fluttering over to the
banana you are holding.
You quikly and
automatically hover your
hand to keep it from
touching your food.

15. Example:
Imagine that a fly
fluttering over to the
banana you are holding.
You quikly and
automatically hover your
hand to keep it from
touching your food.
Although some
responses to stimuli are
involuntary (not under
your control), such as
the blinking of our eyes
and sneezing, many
responses of the
nervous system are
voluntary (under you
control).
In this case, the fly
fluttering toward the
banana is the stmulus
and the hovering of your
hand is the response.

16. FEATURES NERVOUS SYSTEM ENDOCRINE SYSTEM
Signal Electrical impulses
(action potentials)
Chemical impulses
(hormones)
Pathway Transmission Transported by blood
Speed of information Fast Slow
Duration Short-lived Short or long-lived
Types of action and response Voluntary or Involuntary Always Involuntary
Target Localized
(cells connected to neuron)
Often Distant
(many cells can be effected)
Differences Between the Nervous and Endocrine
Systems