how do bones and muscles work? the skeletal systemhow a broken bone heals? how joints help you move?...
TRANSCRIPT
How Do Bones and Muscles Work?
The Skeletal SystemHow a Broken Bone
Heals?
How Joints Help You Move?
What Muscles Do and How Muscles Help you
Move?
Different Kinds of Muscles
Hands-on Activity
The Skeletal System
About two hundred bones make up
your body skeleton. Your skeleton
does for your body what a hand
does for a puppet.
The bones of your skeleton give
shape to your body. Your bones also
support you. Bones also work with
muscles to help you move in all the
ways that you do.
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The Skeletal System
Parts of the skeleton also
protect your soft organs.
The skull protects your
brain like a built-in helmet.
The ribs protect your heart
and lungs.
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The Skeletal SystemBones come in many
shapes and sizes, as the
picture of a skeleton
shows. Bones are hard but
not solid. The longest and
the thickest bone is the
one between your hip and
knee. Its strength helps
hold you upright as you
run and kick.
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The Skeletal SystemWhen you were born, your
skeleton was made mostly of
a rubbery tissue called
cartilage. As you grow, bone
replaces most of the
cartilage. However, some
cartilage remains. For
example, your ears and the
tip of your nose are made of
cartilage. That is why you
can bend them.Test
Review1. About how many bones make up your skeleton system?
2. Which part of your body has a bowl shape?
3. Which part of your body does the “Skull” protect?
4. Some parts of your skeleton have a rubbery tissue. What is this tissue called?
100 bones200 bones BrainHeartLigaments
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How a Broken Bone Heals
Bones are strong.
However, accidents
can cause bones to
break. Pictures called
X rays help doctors
see broken bones.
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How a Broken Bone Heals
Because it is a living tissue,
a broken bone can heal. A
doctor can help the bone
heal correctly by placing
the injured part in a cast
like the one shown. A cast
holds a broken bone in the
correct position while it
mends.
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How a Broken Bone Heals
Bone starts to mend soon
after a break occurs. New
bone cells begin to form. In a
few days, spongy bone tissue
fills the space between the
broken ends of the bone. In the
weeks that follow, the
spongy tissue hardens until
the bone is completely
mended.
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Review
1. How do doctors see broken bones?
2. What can a doctor make to help heal a broken bone?
3. How do broken bones heal? X-rays Z-rays Cast Sling New bone forms
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How Joints Help You Move
The place where two bones of
the skeleton come together is
called a joint. By themselves,
bones are stiff. Joints allow
movement. They give your
skeleton its ability to bend,
twist, and turn.
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How Joints Help You Move
A layer of cartilage covers the
ends of bones that meet at
joints. The cartilage keeps the
bones from grinding together
and wearing out. Tissues
called ligaments hold bones
together at joints.
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Review
1. What helps your skeleton to bend?
2. What keeps your bones from grinding down and wearing out?
3. What tissue holds bones together at a joint? Joints Cartilage Ligaments Muscles Fat
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What Muscles Do and How Muscles Help You Move
A muscle is a tissue made
of muscle cells. Muscles
have the job of making
other body parts move.
Muscles also help give your
body its shape and help
protect the soft organs
inside you.
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What Muscles Do and How Muscles Help You Move
Your muscular system
includes more than six
hundred muscles. Most
of those muscles move
bones, allowing you to
walk, lift, or kick a ball.
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What Muscles Do and How Muscles Help You Move
Some muscles move body
parts that are not bones.
The muscles that move
your eyebrows and lips
help you smile, frown, or
make a funny face. You can
speak and sing because
muscles move your lips,
tongue, and lower jawbone.
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What Muscles Do and How Muscles Help You Move
Muscles are attached to
bones by cords called
tendons. You can feel a
tendon at the back of
each ankle.
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What Muscles Do and How Muscles Help You Move
Muscles can move bones
because muscle cells can
change their shape. Make a
fist and lift it toward your
shoulder. Notice how the
muscle in your upper arm
feels thick and hard. That is
because the muscle cells
contracted, or got shorter, to
make the movement.
Test
Review
1. What tissues give your body it’s shape?
2. List one thing that your muscles do in your face?
3. How do muscles make your body move?
4. What attaches muscles to bones? Muscles Frown Walk Contract Tendons Cartilage
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Different Kinds of Muscles
Arm muscles are
examples of voluntary
muscles. You can
control what they do
and when they do it.
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Different Kinds of Muscles
Your heart is a special kind
of involuntary muscle. It
looks something like a
voluntary muscle and
something like an
involuntary muscle.
However, it works without
your control.
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Review
1. What kind of muscles is in your arms?
2. What kind of muscles is your heart made of?
3. What kind of muscles helps your digestion system?
4. What kind of muscles helps you to run? Voluntary muscles Voluntary muscles Involuntary muscles Involuntary muscles
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Help
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Final Test------------------
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Final Test
This is the final test of the program. You will have ten multiple choice
questions. Please choose the correct answer from the choices given
for each question and then click the next arrow to go to the next
question.
You can not go back or go to the main menu until you finish the test. If
you feel that you need to review more before taking the test, please
click the home button and review the sections you need until you feel
comfortable to take the test.
Final Test1. To which body system do bones belong?
Circulatory
Digestive
Skeletal
Muscular
A
B
C
D
Incorrect
The correct answer is Skeletal
Correct
Good Job
Final Test2. What holds a broken bone in the correct position while it
mends?
Cast
Microscope
Muscles
X ray
A
B
C
D
Incorrect
The correct answer is cast
Correct
Good Job
Final Test3. What do most muscles move?
Bones
The heart
The lungs
Other muscles
A
B
C
D
Incorrect
The correct answer is bones
Correct
Good Job
Final Test4. Which organ pumps blood and is made up of involuntary
muscles?
Brain
Lungs
Heart
Skin
A
B
C
D
Incorrect
The correct answer is heart
Correct
Good Job
Final Test5. If a joint wears out, which one of the structures below would be
mostly the problem?
Muscles
Cartilage
Ligaments
Tendons
A
B
C
D
Incorrect
The correct answer is cartilage
Correct
Good Job
Final Test6. Which one of the structures below is most important to help
muscles move your body?
Cartilage
Ligaments
Tendons
Skeleton
A
B
C
D
Incorrect
The correct answer is tendons
Correct
Good Job
Final Test7. What can a doctor use to see if you broke a bone?
Bone pictures
By exercises
X ray
Cast
A
B
C
D
Incorrect
The correct answer is X ray
Correct
Good Job
Final Test8. If you kick a ball, which one of the structures is most
important?
Ligaments
Tendons
Voluntary muscles
Involuntary muscles
A
B
C
D
Incorrect
The correct answer is voluntary muscles
Correct
Good Job
Final Test9. Which structure provides the most protection for your organs?
Muscles
Skeleton
Ligaments
Tendons
A
B
C
D
Incorrect
The correct answer is muscles
Correct
Good Job
Final Test10. Which one of the following does not have cartilage?
Nose
Ear
End of bones in a joint
Heart
A
B
C
D
Incorrect
The correct answer is heart
Correct
Good Job
Thank you
Hands-on Activity
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