The muscular system is composed of over 600 muscles that make up half of our body weight. Muscles have properties of contractility, extensibility, elasticity, and irritability that allow them to contract and relax in response to stimuli. There are three main types of muscles - voluntary skeletal muscles that are attached to bones and move the skeleton, involuntary smooth muscles found in organs, and involuntary striated cardiac muscle that makes up the heart. Tendons attach muscles to bones to facilitate movement.

1. MUSCULAR SYSTEM
Prepared by:
MARICARR D. ALEGRE

2. • Composed of muscle cells and
tissues held tightly together in
bundles
• There are more that 600
muscles in our body and make
up more than half of our body
weight
• Movement is brought about by
the contraction and relaxation
of muscles

3. PROPERTIES OF
MUSCLES
 Contractility
- able to
become
shorter and
thicker

4. PROPERTIES OF
MUSCLES
• Extensibility
and elasticity
– Ability of
muscles to be
stretched and
to return to
their original
form

5. PROPERTIES OF
MUSCLES
• Irritability
– Contraction of
muscle
stimulated by
several stimuli
like heat, light,
chemical
pressure and
electricity

6. KINDS OF MUSCLE
(BASED ON ACTION)
• Voluntary
Muscles
- they can
be move at
will

7. KINDS OF MUSCLE
(BASED ON ACTION)
• Involuntary
muscle
- cannot be
moved
intentionally

8. TYPES OF VOLUNTARY
MUSCLES
• Skeletal
muscles
- attached to the
skeleton
- they are made
to contract and move
the skeleton
whenever the person
wants

9. TYPES OF VOLUNTARY
MUSCLES
• Striated
muscles
- appear to
have stripes or
striations
- a combination
or light and dark
muscle

10. TYPES OF INVOLUNTARY
MUSCLES
• Smooth
muscle
- found on the
muscles of the
intestines, brain
and other organs
- without
striations

11. TYPES OF INVOLUNTARY
MUSCLES
• Cardiac
muscle
- muscle of
the heart
- striated
but
involuntary

12. TENDONS
• A tissue that is
responsible for
attaching the
muscle to the
bones