Lecture 4 - I. Musculoskeletal System A. Muscle Action B....

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I. Musculoskeletal System A. Muscle Action B. Skeletal Muscles 1. Anatomy 2. Contraction 3. Control of Contractions 4. Whole Muscle Action Muscle Action --Muscles only contract --antagonists—muscles are set up in pairs Need base to apply and direct the force generated Skeletons: --hydrostatic --exoskeleton --endoskeleton (humans mostly) (Read and know Skeletal Systems, page 829-831—stop at “A Typical Long Bone…”) Specifics: --flexion—biceps brachii --extension—triceps brachii --abduction --adduction --protraction
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--retraction --pronation --supination Skeletal Muscle (vs. cardiac and smooth) CW—ADAM Anatomy Review Muscle Cell Comparison (CW and Table 38-3, pg. 815) Muscle Cell/Fiber Skeletal Muscle --elongated cell --multiple peripheral nuclei --visible striations --voluntary Cardiac Muscle --branching cell
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--single central nucleus --visible striations --involuntary Smooth Muscle --Spindle-shaped cell --Single central nucleus --Lack visible striations --involuntary Anatomy of a “muscle”
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This note was uploaded on 04/06/2010 for the course BIO 01-119-10 taught by Professor D'arville during the Fall '09 term at Rutgers.

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Lecture 4 - I. Musculoskeletal System A. Muscle Action B....

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