Transcript Muscular System

The Muscular System
Yeah…just like that!
Questions
• What is the name of the
largest muscle is the body and
where is it?
Questions
• (Gluteus maximus, the buttocks)
Questions
• Where is the hardest
working muscle in the
body?
Questions
• Your Heart is the hardest working muscle in
your body!
Fun fact!: James Brown
(The Godfather of Soul)
was known as the
“Hardest Working Man in
Show Business”
• What percent of your
body weight is muscle?
Questions
• 40%!
• What makes up the most
weight in your body? Bones?
Fat? Skin? Fingernails?
Something else?
• Of course, it’s muscle!!
• Muscles make up the most
weight in your body!
• Have you ever eaten
muscle tissue?
• YES!
Most meat we eat is muscle tissue, such as
hamburger, steak, pork chops, chicken, fish
fillets, lobster tail and shrimp, beef heart, etc).
The same goes for a cow. All those cuts of
beef that we like are just the cow’s
muscles tissues surrounded by fat.
Mmmmmmmm…..yummy muscle tissues.
Muscular System
• You have muscles for
moving body parts, but
many more muscles
work internally to keep
you going.
• The muscular system
consists of all the
muscles in your internal
organs, as well as those
attached to bones.
Muscular System
• How do muscles work/function?
• 1. moves body parts by contracting
(getting shorter)
• 2. controls life functions (breathing,
heartbeat, digestion, etc.)
Muscular System
• Can you rub your tummy while you pat
your head? Try it.
• Whether or not you succeeded, you at
least were able to move around and
give it a shot because you wanted to.
• Now, QUICK!
• STOP YOUR HEART FROM BEATING!
• If you can’t, make your stomach quit
squishing up your most recent meal!
• Some muscles are controllable by your
thinking, other’s aren’t!
Muscular System
• A voluntary muscle can be
controlled by thinking. For example,
the biceps of your upper arm.
• Involuntary muscles automatically
contract on their own, such as your
stomach.
Muscular System
• Muscles aren’t all built the same way, because
they have different jobs to perform.
• The STRONGEST muscles you have are the
ones that you’d use to shove a refrigerator
around or swing a bat with. They’re strong,
but tire pretty quickly.
These are called: SKELETAL or STRIATED MUSCLES
a.) voluntary (you have to think about it)
b). they are attached to bones & structures
needing movement
Muscular System
• Skeletal muscles that move your
body around come in two varieties:
flexors and extensors.
• i. flexor – bends a joint (biceps)
• ii. extensor – straightens a joint
(triceps)
Muscles work in Pairs & PULL
• Skeletal muscles work in pairs. One muscle will
contract and one will extend. Muscles always pull;
they never push. Each muscle needs another
muscle to pull it back into its original position.
Tendons
• Muscles can pull because
they are attached to bones
by tough bands of
connective tissue called
tendons.
• Tendons: attach muscle to
bone and allow bones and
muscles to work together to
provide movement.
Muscular System
• Another type of muscle, called smooth muscle,
and they are good at changing the shape and
thickness of organs like your intestines, your
bladder, and your blood vessels.
2. SMOOTH MUSCLES
a. involuntary (working
automatically)
b. found in internal organs
(intestines, blood vessels)
Muscular System
• Not EVERY one of your internal
organs uses smooth muscle to
run, though.
• We’ve already talked about your
heart and its never-resting job.
• The heart is made of cardiac
muscle, which never has to rest
to keep going for as long as you
live.
3. CARDIAC MUSCLE
a. involuntary, thankfully
b. found only in the heart
Muscular Dystrophy
• There are many reasons why
someone would be confined
to a wheelchair. Brain or
nerve damage (paralysis)
could be one, but another
genetic birth defect that
affects thousands around the
country is muscular
dystrophy.
Muscular Dystrophy
• Muscular dystrophy is a disease
where a person’s muscles weaken
after birth and the sick have little
control over them.
• Over time, people with M.D. will
often end up in wheelchairs as
their muscles fail them. Their
minds are completely healthy,
though. No cure currently exists
for this disease. The MDA (Jerry’s
Kids) is the most prominent charity
searching for a cure.
Steroids
• The drive to be bigger, “better” looking, or an
improved athlete has caused people to pursue
any means possible to achieve these goals.
• …and finds that instantaneous results aren’t
exactly happening.
• Steroid abuse can lead to dozens of side
effects due to way too many hormones. The
effects can be embarrassing to deadly. Here
are just a few:
• Problems: acne, heart & liver problems,
depression & mood swings, stunted growth,
cancer, death, unwanted body hair or
baldness, cancer, death…
• or at the least..you could end up looking like
this. AhhHH! 
• STAY OFF THE STEROIDS!
Review
•What are the 2
functions of the
muscular system?
Review
• 1. moves body parts by contracting (getting shorter)
• You would collapse to the ground and never be able to
eat, drink, or fight off any attacker. You’d die of thirst,
starvation, or being eaten by fire ants.
• 2. controls life functions (breathing, heartbeat,
digestion, etc.)
• You would instantly empty his bladder, you’d, uh, poop
your pants, stop digesting his food, stop moving air in &
out of your body, and your blood would come to a
standstill. Life span: about 5 minutes, max.
Review
• What are the 3 types of muscles?
Review
• • Skeletal muscles –voluntary (we control
them), are striped or striated, and move
bones
• • Cardiac muscle –involuntary ( we cannot
control them), are striated and found only in
the heart
• • Smooth muscle –involuntary, found in
digestive organs and blood vessel walls,
contract rhythmically without getting tired.
Review
•Do Muscles PULL or
PUSH?
Muscles work in Pairs & PULL
• Skeletal muscles work in pairs. One muscle will
contract and one will extend. Muscles always pull;
they never push. Each muscle needs another
muscle to pull it back into its original position.
• What is the name of the
disease talked about in this
presentation that affects
muscles? Describe what it
does to your body.
Muscular Dystrophy
• Muscular dystrophy is a disease
where a person’s muscles weaken
after birth and the sick have little
control over them.
• Over time, people with M.D. will
often end up in wheelchairs as
their muscles fail them. Their
minds are completely healthy,
though. No cure currently exists
for this disease. The MDA (Jerry’s
Kids) is the most prominent charity
searching for a cure.
2 Functions of the Muscular System:
1.
2.
2 Muscle Types:
1.
2.
3 Structures of Muscles:
1.
a.)
b.)
Example Location:
Work in ________ & always _______
Tendons:
Largest Muscle:
2.
a.)
b.)
Hardest Working Muscle:
Example Location:
% Bodyweight (Muscle):
3.
a.)
b.)
Muscle System
Example Location:
2 Functions of the Muscular System:
1. Moves body parts by contracting (muscles getting shorter)
2. Controls life functions (breathing, heartbeat, digestion, etc)
2 Muscle Types:
1. Voluntary Muscle – can be
controlled by thinking. For example:
biceps on upper arm.
2. Involuntary Muscles –
automatically contract on their own,
such as your stomach.
Largest Muscle: Gluteus Maximus,
(buttocks)
Hardest Working Muscle: THE HEART
% Bodyweight (Muscle): 40%
Muscle System
3 Structures of Muscles:
1. SKELETAL/STRAITED MUSCLES
a.) voluntary
b.) attached to bones & structures needing movement
Example Location: TRICEP/BICEP
Work in __PAIRS______ & always __PULL_____
Tendons: Allow bones & muscles to work together to
provide movement
2. SMOOTH MUSCLES
a.) involuntary
b.) found in internal organs (intestines, blood vessels)
Example Location: STOMACH
3. CARDIAC MUSCLE
a.) involuntary, thankfully
b.) found only in the heart
Example Location: THE HEART