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The Musculoskeletal
System
5/24/2017
1
The Musculoskeletal System

The organs of the
musculoskeletal
system are the
bones and skeletal
muscle
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Structural features of the
Skeleton

There are three types
of connective tissue in
the skeleton
Bones
 Cartilage
 Ligaments

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Joints in the Human Body
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About how
many
muscles do
you think the
human body
has?
Answer =
650
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Where do we have
muscles?
We have muscles all over our body!
Legs
Face
Tongue
Eyes
Hands
Arms
Heart
Ears
Neck
Stomach
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How many muscles do
you think are in our
face and neck?
Our face and neck contain about
one-fourth of the muscles in our
body.
That is about 162 muscles.
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Smile or Frown?
1)It takes 17 muscles to smile
and 43 muscles to frown
2)It takes 26 muscles to smile
and 62 muscles to frown
What conclusion can we make from these
two statements?
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What are muscles made of?
Muscles are made of hundreds of
tiny fibers.

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Can you feel some of
your muscles?
Hold a book in front of you. Where
in your arm do you feel the muscles
move?
Move your neck from left to right and
up and down. What do you feel?
Move your fingers around. Where do
you feel those muscles move?
Stand on your toes. Do you feel the
muscles in the back of your legs?
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What do muscles need?



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Muscles need oxygen in order to
work properly.
When they do not get enough
oxygen, they can get sore or
cramp up.
When the muscles in your heart
do not get enough oxygen, you
can have a heart attack.
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How do muscles
move our bones?

Do muscles pull or push our bones?
•Muscles pull in order to make our
bones move.
•Our muscles usually work in pairs.
•One muscle contracts (pulls) while
the opposite muscle relaxes
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When your arm is straight:
•Your bicep is
relaxed
•Your Tricep is
contracted
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When you arm is bent:
•Your bicep is
contracted
•Your tricep is
relaxed
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3 Types of muscles
There are three different types of
muscle in our body.
1. Skeletal muscles
2. Smooth muscles
3. Cardiac muscles
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Skeletal muscles
•Are voluntary muscles that
move bones.
•Are called striated because
they look striped
•Are attached to tendons,
which are attached to bones.
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Cardiac Muscle
•A special kind of involuntary,
striated (striped) muscle that
makes up the heart.
•The muscles in the heart
contract in order to pump the
blood through your body.
•If your muscle stops pumping
the blood, you have a heart
attack.
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Smooth Muscles
•Are involuntary muscles that make up
the blood vessels, stomach, intestines,
and other organs
• We can not control our smooth
muscles
•Examples:
•Bladder
•Uterus
•Esophagus
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What happens when we
do not use our muscles?
Our muscles get smaller,
which makes them weak.
Can you think of some
examples of when this may
happen?
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Problems with the
Musculoskeletal System



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Osteoporosis
Rheumatoid arthritis
Fibromyalgia
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