Transcript Slide 1 - Garnet Valley

The Muscular System
Chapter 3, Lesson 1 Part 2
Introduction to the Muscular System
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Deltoid
Trapezius
Triceps
Biceps
Abdominal Muscles
Quadriceps
Gastrocnemius
Anterior Tibial
Introduction to the Muscular System
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How many muscles are in the human
body?
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600
Which muscle is the most important?
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Heart
Facts About Your Muscles
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Help you move and maintain posture
 Both
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needed to maintain good skeletal system health!
Make up ½ of your body weight
They are working all the time, even when you are
standing or sitting still.
Each muscle has a very specific job.
Muscles are typically grouped in pairs
 Examples:
Triceps and Biceps, Quadriceps and
Hamstrings
Tendons connect your muscles to bones!
How our muscles work:
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All muscles work on the same principle:
 They
contract (shorten) and relax (lengthen) to cause
movement.
 http://kidshealth.org/kid/htbw/_bfs_MSmoviesource.ht
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Types of Muscles
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Voluntary:
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Muscles that you control
Muscles that help you open
and close your hand and
muscles in your leg that help
you walk.
Examples?
Involuntary:
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Muscles that you do not
control.
Examples: Heart, Intestinal
Muscles, Stomach Muscles
Types of Muscles
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Smooth:
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Muscle found in body
organs, blood vessels, and
glands.
Smooth muscle is involuntary.
Cardiac:
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Muscle is only found in the
walls of the heart.
Is an involuntary muscle that
continuously contracts and
relaxes to pump blood
through the body.
Muscular Problems
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Strain: Muscle is stretched too far.
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Cramps: Muscle contracts and doesn’t relax.
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Low Back Pain: Caused by poor posture or weak
core muscles. Can also be caused by a lack of
exercise.
Heavy backpacks!
Muscular Problems
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Back Pain:
 Heavy
backpacks – Students who carry overloaded
backpacks might be endangering their backs. When
backpacks are too heavy, students lean forward, which
can lead to rounded shoulders and a curved upper
back.
 Some orthopedists recommend that a backpack should
weigh no more than 15 percent of a student’s weight.
Caring for your Muscular System
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Sleep in the fetal position on a firm
mattress.
Exercise regularly.
Warm up before exercising.
Select foods containing carbohydrates
or proteins.
Practice weight management.
Lift objects by bending your knees.