Download File - Mr Michael McCloskey

Science Lesson 8
Muscles and Bones
What to think about….
 What
are the functions of
muscles?
 How do muscles work?
 What are some of the different
types of muscles?
 What happens to muscles based
upon their amount of use?
Muscles and bones are joined
or attached by tissue called
 It
is the tendons that allow muscles to
move the bones.
All body movement requires
muscles. What if we are not
moving?
 Even
sitting still we
are using muscles.
The heart beats, the
diaphragm causes us
to breathe, etc.
About how much of your body
weight is muscle?
What the Muscle Is Made Of?
• Your muscles are made of small muscle fibers.
•Tendons are stretchable material that connects
the muscles to your bones.
How do our muscles work?
Our muscles work by contracting and relaxing
How do muscles work?
Muscles
and
work by
.
Skeletal muscles make us
move. However, muscles
are only capable of one
type of force.
Since muscles can only pull and
not push, how does this effect
the way they work in the body?
 The
muscles have
to work in pairs.
One muscle of a
pair bends a joint,
while the other
straightens it back
out.
Tricep
Bicep
•When the bicep contracts and the
triceps relaxes, the arm bends.
•When the Tricep contracts and the
bicep relaxes the arm straightens.
 When
you don’t use your muscles
they become
and
.
Unused
muscle
cells actually
become smaller if
not used regularly.
But, if used regularly,
they become larger and
stronger.
How to Make Healthy
Muscles!!!

Run

Lift weights

Play sports

Drink milk

Eat healthy food
Facts about the muscles!!!
Your heart is a muscle.
 Your tongue is a muscle.
 There are about 350 muscles in the
human body.
 Muscles are made of fibers.
 The muscular system is the largest
system in your body.
