Transcript The Muscular System

The Muscular
System:
Moving your Body
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Can you sit totally still without
moving a muscle?
Try it! (for 30 seconds…)
 Did you do it?
 Probably not!

Did you blink?
 Did you breathe?
 Did you swallow?

It’s impossible to sit absolutely still without
ANY muscle movement… why???
What is the muscular system?
 They muscular system is made up of all the
MUSCLES and TENDONS in your body.
There are more than 600 muscles in your body!
 MUSCLES are: ORGANS that can RELAX
and CONTRACT, and provide the FORCE to
MOVE your body parts.
 TENDONS are: STRONG CONNECTIVE
TISSUE that ATTACH MUSCLES TO BONE.
(This connection allows your muscles to move
your bones.)
What are muscles made of?
• LONG, STRETCHY, elastic cells and
fibers
• These muscle cells CONTRACT and
RELAX when they get MESSAGES
from your NERVES.
Nucleus
Why do I need tendons?

Tendons ATTACH MUSCLES
TO BONE helping the 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).

TENDON
What does your muscular system do?
(What is its FUNCTION?)
• HOLDS BONES together so you
can MOVE
• HOLDS ORGANS in place
• Helps you CHEW & DIGEST your
food
• BLINKS your eyelids
• PUMPS YOUR BLOOD
• Allows you to WALK, RUN, play,
laugh, smile, etc.
How are MUSCLES controlled?

Your BRAIN sends MESSAGES to your
muscles using the NERVOUS SYSTEM.
VOLUNTARY MUSCLES - you CHOOSE to
use them and CONSCIOUSLY CONTROL
their movement.
 Examples: MOST SKELETAL MUSCLES
(arms, legs, hands, feet, etc)
INVOLUNTARY MUSCLES - WORK
WITHOUT YOU THINKING about them.
 Examples: HEART, EYELIDS,
DIAPHRAGM (breathing) and
DIGESTIVE SYSTEM.
How do muscles work?
Muscles CAN’T PUSH. They ONLY PULL
(CONTRACT) (and then RELAX to return to
original length).
 Muscles often WORK IN PAIRS, so that they can
pull in DIFFERENT OR OPPOSITE directions.
• Example: BICEP bends the elbow, and TRICEP
extends the elbow.

THREE TYPES OF MUSCLES
1) SKELETAL MUSCLES
(attached to bones)
2) SMOOTH MUSCLES
(in your digestive system)
3) CARDIAC MUSCLES
(in your heart)
THREE TYPES OF MUSCLES
1) SKELETAL MUSCLES
(attached to bones)
2) SMOOTH MUSCLES
(in your digestive system)
3) CARDIAC MUSCLES
(in your heart)
What are the 3 types of muscles?
1) SKELETAL MUSCLES – are
ATTACHED to your BONES.
These are VOLUNTARY muscles,
because you control them.
They REACT QUICKLY, but get
TIRED EASILY.
What are the 3 types of muscles?
2) SMOOTH MUSCLES – are
INSIDE your INTERNAL ORGANS
(eg. In your digestive system).
These are INVOLUNTARY
muscles, because the work
AUTOMATICALLY.
They REACT SLOWLY, but DON’T
GET TIRED EASILY.
What are the 3 types of muscles?
3) CARDIAC MUSCLES – are
found ONLY in your HEART.
These are INVOLUNTARY
muscles, because the work
AUTOMATICALLY. They DON’T
GET TIRED.
How can you STRENGTHEN your
muscular system?
• EXERCISE EVERYDAY! Exercise makes individual muscle
cells grow wider, thicker, and stronger.
• EAT foods that are HIGH IN PROTEIN every day – protein
helps to build strong muscles.
Fun Facts about the Muscular System
• You have about 650 muscles in your
body. Muscles make up HALF your body
weight.
• Eye muscles are the busiest muscles in
the body. Scientists estimate they may
move more than 100,000 times a day!
• The largest muscle in the body is the
gluteus maximus muscle in the buttocks.
• Smiling is easier than frowning. It takes
20 muscles to smile and over 40 to
frown.
Have you noticed that certain
systems work together?
Muscular system helps the
skeletal system MOVE.
Muscular system helps
the Circulatory system
PUMP BLOOD around the
Muscular system helps
body.
Nervous
system sends
Digestive
system DIGEST
MESSAGES
themove it
FOODtoand
muscular
system.
through
your body.