the muscular system with your host… arnold schwarzenegger
Post on 02-Jan-2016
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The Muscular System
With your host…Arnold Schwarzenegger
What do muscles do?
• Muscles move you! Without muscles you couldn't open your mouth, speak, shake hands, walk, talk, or move your food through your digestive system. There would be no smiling, blinking, breathing.
• Muscles turn energy into motion. (Think of all the things you do that you need your muscles for! It would be impossible for you to do anything without your muscles!)
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Did you know…?
If all 600+ muscles in your body pulled in one direction, you could lift 25 tons!!!
That’s about the weight of THREE African Elephants!
Types of Muscles
Smooth muscles
• Also called involuntary muscles (Your brain and body tell these muscles what to do without you even thinking about it.)
• Located in your internal organs.• Examples: in diaphragm, walls of
digestive organs.
Cardiac muscle
• Found only in the heart.• Cardiac muscle is striated, like
skeletal muscle.
Skeletal Muscle• Also called voluntary muscle.
(They only work when you specifically tell them what to do).
• These are the muscles that we can see, feel, and control.
• Make up 50% of your body weight.• Examples: bicep, tricep.
What's the job of skeletal muscle?
• Body movement• Posture• Body heat• Communication
Major Skeletal Muscles
How do you move?• You move because pairs of muscles
work together.– When one muscle of a pair contracts,
the other relaxes.•Flexor - muscle that flexes, or
bends a joint•Extensor - muscle that extends, or
straightens a joint– Muscles always pull!
Other muscle knowledge…
• Over time, muscles can become larger or smaller, depending on whether or not they are used.
• Blood carries energy-rich molecules to the muscles so they can do their work.
Let’s Review…
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