The skeletal and muscular systems work together to support the body, protect organs, and enable movement. The skeletal system is made up of 206 bones that provide structure, protect vital organs, and allow the body to move by working with muscles. The muscular system contains 650 muscles that contract and relax to move bones and hold organs in place. Both systems require proper nutrition and exercise to stay strong and healthy.

1. THE SKELETAL SYSTEM
&
THE MUSCULAR SYSTEM
For Grade 4
By Ms. Venyde

2. • The skeletal system is also called the
skeleton.
• It is made up of bones.
• Bones are made of a hard
substance and are not easily broken.
• There are 300 bones in our body
when we are a baby, but there are
206 bones in our body when we are
an adult.

3. The skeletal system has 3 important jobs
Our Skeletal System is all the
different shapes and sizes of bones in our
body. There are three important jobs that
the skeleton is responsible for.

4. THE FIRST IMPORTANT JOB
Our skeleton supports our
body and gives our body its
shape and size. All people have
their own shape and size so
everybody can be different.

5. THE SECOND IMPORTANT JOB
Some bones of our skeleton
protect our vital organs, such
as the heart, the brain and the
lungs. I protect the
brain.
I protect the
heart and
lungs.

6. THE THIRD IMPORTANT JOB
Our skeleton enables us to
move. It allows us to sit, walk,
dance, run, jump, bend, skip,
flip, roll and twist or turn. For
our body to move, the skeleton
system works with another
system –Muscular System.

7. • The muscular system is made of
muscles and tendons.
• Tendons attach our muscles to our bone
helping our body move.
• We have about 650 muscles in our body.
Relax and contract to move bones.
• Our muscles make up half of our body
weight.
• How much do your muscles weigh?
Relax and
Contract

8. • Hold our organs in place
• Hold our bones together
so that we can move
• Help us chew my food
• Open and close our
eyelids
• Pump our blood
• Allow us to run and play
• Help us to smile!
My muscles are important because they….

9. • In order to grow strong
bones, we must drink milk
and eat foods that contain
calcium such as
cheese, eggs, yoghurt, green
vegetables and citrus fruits.
• Keep a good body posture
to help backbone grow
properly.
• Exercise everyday.
• Protect our bones
especially during sports.
Some ways to take care of our skeleton are ….

10. • Eat foods from the
meat group every day.
They are high in protein
which helps to build
strong muscles.
•Exercise everyday.
Some ways to keep our muscles strong ….

11. FUN AMAZING FACTS
 Half of your bones are in your hands and feet.
 The longest bone in your body is your femur. It is 18 1/2
inches long when you are an adult.
 The smallest bone in your body is located in your ear-
stirrup
 Your face has 14 bones in it.
 You are using 12 facial muscles when you smile.
 Your leg is the fastest growing bone in your body.
 A giraffe has the same amount of bones in its neck as you
have in your neck. Its neck is just longer.
It takes more muscles to frown than to smile. Smile, then!