Muscular system
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Transcript of Muscular system
![Page 1: Muscular system](https://reader033.fdocuments.in/reader033/viewer/2022061222/54be931f4a7959ff518b456d/html5/thumbnails/1.jpg)
6th Grade Science
Muscular System
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I. General
A. Numbers = 600 musclesB. Terminology
1. Muscle means “little mouse”C. Amount
1. 50% of body weightD. Groups
1. Involuntary = Not controlled2. Voluntary = You have to think about
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E. Types
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E. Types
1. Cardiac Muscle (Heart)i. Moves blood
2. Smooth Musclei. Move fluids inside bodyii. Slow actingiii. Long lasting
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3. Skeletal Muscle
i. Voluntaryii. Get tirediii. React quicklyiv. Pull on bones (tendon)
a. Must work in pairsv. Maintain posturevi. Stabilize jointsvii. Generate heat
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II. Injuries
A. Pulled muscle1. Overworked or overstretched2. Tendons can also be partially torn
B. Cramps1. Muscle stays contracted
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III. Diseases
A. Muscular Dystrophy – Convert muscle to fat
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IV. Structure
A. Muscle Bundles
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B. Skeletal Muscle Cell
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C. Myofibril
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D. Skeletal Muscle Fibers
1. Actin2. Myosin
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V. Mechanism of Contraction
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VI. Skeletal Muscle Motor Units
Figure 10.1a
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