Third Quarter Lesson for Science 10. the nervous system is the highly complex part of an animal that coordinates its actions and sensory information by transmitting signals to and from different parts of its body.

1. The Nervous System
The Structure of the Nervous System
CATHERINE C. DELA CRUZ
MELC: Describe how the nervous system
coordinates and regulates these
feedback mechanisms to maintain
Homeostasis
S10LT-IIIc-36

2. What is the nervous
system?
> The nervous system is your body’s
command center. It’s made up of
your brain, spinal cord and nerves. Your
nervous system works by sending
messages, or electrical signals, between
your brain and all the other parts of your
body.

3. What does the nervous system do?
These messages regulate your:
 Thoughts, memory, learning and feelings.
 Movements (balance and coordination).
 Senses (how your brain interprets what you see,
hear, taste, touch and feel).
 Wound healing.
 Sleep.
 Heartbeat and breathing patterns.
 Response to stressful situations, including sweat
production.
 Digestion.
 Body processes, such as puberty and aging.

4. What are the Major Parts of the Nervous
System?
 Central Nervous
System
 Peripheral Nervous
System

5. • The brain and spinal cord
make up your CNS.
• The CNS serves as the
main processing center
for the entire nervous
system
1. Central Nervous System (CNS)

6. A. Brain
> This is an organ located within the skull that functions as
organizer and distributor for the body.
a. Cerebrum
 Large, upper part of the brain that controls activity and
thought.
b. Cerebellum
 The part under the cerebrum that controls posture, balance,
and coordination.
c. Brain Stem
 The part that connects the brain to the spinal cord and controls
automatic functions such as breathing, digestion, heart rate,
and blood pressure.

7. B. Spinal Cord
 This serves as a channel for signals
between the brain and the rest of
the body, and controls simple
musculoskeletal reflexes without
input from the brain.

8. 2. Peripheral Nervous System
 It connects the central nervous
system to the organs and
limbs.

9. Two Main Division of PNS
A. Somatic Nervous System
B. Autonomic Nervous System

10. A. Somatic Nervous System
This system is associated with the voluntary control of body
movements.
a. Spinal Nerves
 The nerves that carry motor and
sensory signals between the
spinal cord and the body.
b. Cranial Nerves
 The nerve fibers that carry
information into and out of the
brain stem.

11. B. Autonomic Nervous System
This system is associated with the involuntary control of
body movements.
a. Sympathetic
 It is activated when the body is in a dynamic role or stress.
(e.g., increased heart rate and breathing, dilation of pupil and
sweating)
b. Parasympathetic
 It maintains body functions and restores the body to normal
or relaxed mood.

12. Summary
 The nervous system is a network of neurons whose main feature is to
generate, modulate and transmit information between all the different
parts of the human body.
 The nervous system consists of two divisions;
1. The Central nervous system (CNS) which is divided into two divisions;
The Brain and the Spinal Cord.
2. The Peripheral Nervous System (PNS) which is divided into two
divisions; the Somatic(Voluntary control) and Autonomic(Involuntary
control).
 The nervous system plays a role in nearly every aspect of our health and
well-being. It guides everyday activities such as waking up; automatic
activities such as breathing; and complex processes such as thinking,
reading, remembering, and feeling emotions.