Assignment 6 how muscles work
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How Do Muscles Work? Ms. B’s 6th grade science class By Beatriz Bofill 1 Thursday, October 11, 12
Transcript of Assignment 6 how muscles work
How Do Muscles Work?
Ms. B’s 6th grade science class
By Beatriz Bofill
1Thursday, October 11, 12
Three Kinds of Muscle
Cardiac
Skeletal
Smooth
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Three Kinds of Muscle
Cardiac
Skeletal
Smooth
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Muscle Fibers
• A muscle is a bundle of many cells called fibers
diameter of a strand of hair diameter of a muscle fiber 100 microns ≈ 100 microns
typical cell ≈ 40 micronscannot be seen by the naked eye
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dark band light bandSarcomere
Myofibril and Sarcomere
Muscle Fiber
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Actin and Myosin Filaments
proteins sliding past each other
Sarcomere
Myofibril
Myocyte
Myofibrils
Filaments
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Actin and Myosin Filaments
proteins sliding past each other
Sarcomere
Myofibril
Myocyte
Myofibrils
Filaments
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Nerve Signaling Muscle Cell
Nerves
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Relaxed Muscle to Contracted Muscle
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Animation of a Muscle Contraction
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Vocabulary Words
myocytemyofibrilsarcomerefilamentactinmyosinmicron
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