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The Muscular System Pgs 46-47
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Intro Video
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2 Functions of the muscular system
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1 st Function of the muscular system
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Function of the muscular system Provides movement In conjunction with the skeletal system
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2 nd Function of the muscular system
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Helps organs carry out life functions
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3 Types of Muscles
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1 st Type of Muscle.
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Skeletal Muscles
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Properties of Skeletal Muscles Majority of your muscles
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Striated Striped appearance
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Connect to bones with tendons
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They are voluntary
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These muscles help you move.
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React quick, but also tire quick
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How muscles deal with getting tired The fibers inside alternate being used
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Take a pencil Fold a paper clip so it is resting on the pencil Not supporting paper clip in any way and it must remain perpendicular to paper Try to make the paper clip stay still Or hold above paper and try to make stay still
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It’s a good thing your heart is not made of Skeletal Muscle How long can you make your hand a heart Open fully and close every second
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2 nd Type of Muscle Smooth Muscle
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Smooth Muscles: found in the walls of internal organs and the blood vessels.
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They are involuntary
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They react slowly and and tire more slowly than skeletal muscle.
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3 rd Type of Muscle Cardiac Muscles
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Cardiac Muscles: Muscles that make up the heart. Striated
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They are involuntary
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Cardiac Muscles The muscle can contract repeatedly, it will not tire.
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What a real heart beating looks like
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http://www.youtube.com/watch? annotation_id=annotation_6114 36&feature=iv&src_vid=Pes9O5 z8efk&v=uR4t__B-Zwg
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Why do your muscles feel “bigger”?
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Figure it out based on animation http://www.edumedia- sciences.com/en/a85-biceps-and-triceps
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Muscles Work in Pairs Muscles can only contract, they do not extend or get larger. Skeletal muscles work in pairs so when one contracts the other relaxes. Examples: Biceps/Triceps, Hamstring/Quadriceps
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String can only pull not push String on both sides of a ruler demonstration
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Smart Board Venn Diagram
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Bpop
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Muscle Practice sheet
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