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Vers. 07/2020 © Kesler Science, LLC
Muscular
System
Presented by Kesler Science

© Kesler Science, LLC
Muscular System
• An organ system consisting of over
640 muscles
• Main functions:
• Allows movement in the body
• Maintain posture
• Stabilize joints
• Generates heat
The Muscular System

Muscular System
• Each muscle is a discrete organ made
of skeletal muscle tissue, blood
vessels, tendons, and nerves.
• Found in the heart, digestive organs,
and blood vessels
• Muscles serve to move substances
throughout the body.
The Muscular System
Summarize the main functions
of the muscular system in
your own words.
each muscle is a discrete organ made
up of blood vessels, tendons, and
nerves, muscles are found in the
heart, digestive organs, and blood
vessels, muscles serve to move
substances throughout the body

Think About It
How might our life be different if we lacked our muscular
system? Do you think we would still be able to survive? Explain
your reasoning.
no because we would just be stiff skeletons because the muscles allows us to
be flexible and move

Muscular System A
B
C
• Excitable or Irritable – capable of
receiving and responding to
stimulation by nerves (A)
• Contractible – capable of shortening
(B)
• Extensible – can be stretched
without damage (C)
Properties of Muscles

Muscular System
C
D
• Elasticity – able to return to resting
shape after being contracted or
extended (D)
• Adaptability – can change in
response to how it’s used, get bigger
or smaller (E)
Properties of Muscles

Muscular System
Muscle Movement
Read the definitions of
involuntary and voluntary.
In your own words describe how
you think this relates to the
muscular system.
Don’t peek at the next slide!
Involuntary
Controlled by the
unconscious part of
the brain
Voluntary
Controlled
consciously by a
person
because some muscles move
unconsciously, like your heartbeat.
and some you have to move
manually. like walking.

Muscular System
• Voluntary – controlled consciously
by a person
• Examples: speaking, walking,
writing
• Involuntary – controlled by the
unconscious part of the brain
• Examples: heartbeat, intestine
moving waste, breathing
Muscle Movement
Don’t peek! Slide this over after you have answered
the questions on the previous slide.
Don’t peek! Slide this over after you have answered
the questions on the previous slide.

Think About It
Think back about the movements you have made the past 30
minutes. Which movements have been voluntary? Which
movements have been involuntary?
my hearbeat is involuntary, my talking is voluntary, and my walking is voluntary.

Muscular System
• Cardiac – form the wall of the heart and
controls your heartbeat
• involuntary
• Smooth – (visceral) –Weakest of all muscle
tissues found in organs and perform unique
functions like grinding, churning or moving
• involuntary
• Skeletal – connect to the skeleton in at least
one place to move parts of bones closer to each
other
• voluntary
Types of Muscles
Make a prediction. Identify each
type of muscle as involuntary or
voluntary. Type your answers first.
Then, slide the boxes over to
check your answers. Don’t peek!
Cardiac:
Smooth:
Skeletal:
involuntary
involuntary
voluntary

Quick Action: INB
Muscular System
Use the word bank
below to label the
main structures of the
muscular system. Type the
main function of the muscular
system in the box provided.
Main Function:
muscle around the heart
muscle that lines organs
muscle connected to bones
skeletal
muscle
to give our body movemnet
cardiac
muscle
smooth
muscle

Muscular System
• Named for the structure near which a
muscle is found
• Muscle near the Tibia = Tibialis
anterior
Location of Muscle
How do muscles get their names?

Muscular System
• Maximus – largest –
• Gluteus Maximus
• Medius – medium -
• Gluteus Medius
Size of Muscle

Muscular System
Rectus
Abdominis
Transverse
Abdominis
External
Oblique
• Rectus– muscle fibers run parallel to
midline
• Transverse – muscle fibers run
perpendicular to midline
• Oblique – muscle fibers run diagonal
to midline
Direction of Muscle

Muscular System
Number of tendons of origin.
Prefix determines the number.
• Biceps = two
• Triceps = three
• Quadriceps = four
Number of Origins of Muscle

Muscular System
Trapeziu
s
Deltoid
Rhomboideus
• Deltoid –having a triangular shape
• Trapezius – having a trapezoid shape
• Rhomboideus – having a diamond
shape
• Serratus – having a saw-toothed
shape
Shape of Muscle

Think About It
The muscular system has three types of muscles. Why type of
muscle do you think is most important to the muscular system?
Explain your answer.
i think cardiac muscle is most important because it keeps our heart
safe from getting hurt

Muscular System
• Origin – attached to less or
immovable bone
• Insertion – attached to the movable
bone
Origin and Insertion

Muscular System
What holds the bones and muscles together?
A
B
• Tendons - attach muscle to bone (A)
• Facia - surrounds muscles and
connects muscle to muscle (B)
Connective Tissue

Muscular System
3
• Nervous system (3)working with
the muscular (2)and skeletal
system(1) is essential to the
voluntary skeletal muscles.
• If nerves are severed, they will not
be able to produce muscle
movement.
Working With Other Systems

Quick Action: INB
Muscular System
Try to come up with 3-5
ways the skeletal system
works with other systems
in the human body.
Be prepared to share your
answers.
Hint: Think about the
three muscle types.
What body
systems work
with the
muscular
system?
our integumentary
system because
our skin covers
and protects our
muscles
the skeletal system
because it allows our
body to have shape and
mobility.
Type your answer
here
the cirulaurtory system
because when we
move our bodies and
work our muscle, our
heart starts beating
faster.
Type your answer
here

Muscular System
• Muscular Dystrophy – genetic
disease that cause damage of muscle
fiber causing weakness, immobility,
and imbalance
• Cerebral Palsy – congenital disorder
that affects the posture, balance, and
motor functions
Diseases of the Muscular System

Muscular System
• Amyotrophic Lateral Sclerosis (ALS) –
Lou Gehrig’s disease – neurodegenerative
disease that causes loss of control on
voluntary muscles.
• Tendonitis – tendons get inflamed or
irritated most common in wrists, elbows,
shoulders and heels causing pain and
swelling
Diseases of the Muscular System

Last Look
This or That
Let’s see if you can crack the code.
You will need to identify which
structure is being described in each
statement.
(Hint: Slide the word over to reveal
a number. You will need the
number for the secret code.)
4
found in organs and perform unique
functions like grinding, churning or
moving
8
6
surrounds muscles and connects muscle to
muscle
7
7 attach muscle to bone 3
2
Controlled by the unconscious part of the
brain
0
1
Type of muscle that connects to the
skeleton and allows movement of the
body
3
0
form the wall of the heart and controls
your heartbeat
4
9 controlled consciously by a person 5
SECRET CODE:
smooth skeletal
facia tendons
facia tendons
skeletal smooth
smooth cardiac
voluntary involuntary
voluntary involuntary
730149

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