Functions of the muscular system

The Muscular System
Susan Levin 2011
What muscles are you using right now?
Make a list
Exit Ticket
What are the functions of the muscular system?
Why do muscles work in pairs?
Science Words to know
Voluntary muscle
Involuntary muscle
Skeletal muscle
Smooth muscle
Cardiac muscle
What do muscles do?
• Hold my organs in place
• Hold my bones together so
that I can move
• Help me digest my food
• Help me breathe
• Open and close my eyelids
• Pump my blood
• Allow me to run and play
• Help me to smile
Functions of the muscular system
• Produce movement
• Maintain Posture
• Stabilize joints
• Generate heat
Moving the human body
• Muscle - an organ that contracts
and gets shorter- this provides
the force to move your body
• Muscles and bones work
together, coordinated by the
nervous system
Muscles of the
Parts of the muscular system
• Muscles – over 600
• Tendons
Tendons attach muscles to bone
helping your body move.
Feel your tendon right above your
heel in the back of your leg. This
is the thickest tendon in your body
– Achilles tendon.
What are muscles made of?
• Stretchy, elastic
muscle cells
• Made of proteins
What else is stretchy like a
Muscle Control
• Voluntary muscles - muscles that you
are able to control
Can you think of examples?
• Involuntary Muscles - you can not
move them consciously. They just
keep working
Can you think of examples?
What muscles are both voluntary and
involuntary? (I can think of 2)
Where to find information
• Use textbook pg 51-53
Striated means striped.
• Appearance, voluntary/involuntary, where found, when it tires,
Compare and Contrast
• Use textbook page 51-53
to make a Venn Diagram
Types of Muscles
Types of muscles
Types of Muscles - Skeletal
• Skeletal Muscles-muscles that
move bones
• Attached to bones by tendons
• Most numerous in the body
• Look striped or striated
• Voluntary muscles
• Tire easily
• Quick to react
Types of Muscles - Smooth Muscles
Smooth muscles - non-striated
Move the internal organs
Contract and relax slowly
Example- small intestine,
stomach, digestive system,
Types of Muscles - Cardiac Muscle
• Cardiac muscle - found only in
the heart
• Involuntary
• Striations (stripes)
• Contracts about 70 times a
minute every day of your life.
• Does not tire
• Slow to react
• Medmovie : heart anatomy …
then anterior heartbeat
How Muscles Work
• Skeletal muscles – work in pairs
- when one muscle contractsanother muscle relaxes
muscles work in pairs - bbc
• Muscles always PULL - never
• Muscles use glucose and
oxygen to make energy
• Produce heat when they
• Muscles that are not exercised
become smaller
Muscles and Bones Work Together
• Bones and muscles: the
skeletal and muscular system
United streaming 2 min
A review
One way to keep muscles strong…
• Eat foods from the
protein group every day.
They are high in protein
which helps to build
strong muscles.
• What kinds of foods are high
in protein?
• Exercise every day.
What are some things you
can do every day to help
keep your muscular
system healthy?
Learning “Write”:
• If smooth muscles had to be consciously
controlled what problems do you predict in
day-to-day living? Write a story.
• Write an article for the Courier about
preventing skeletal and muscular injuries.
Focus on ways the athletes can reduce the
risk of injuries. Use textbook p. 46 - 49