Musculoskeletal system

Musculoskeletal system - I) Musculoskeletal system a....

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I) Musculoskeletal system a. Muscle Action b. Skeletal Muscules 1. Anatomy 2. Contraction 3. Control of contractions 4. Whole muscle action A) Muscle Action Muscles can only contract o Skeletal muscles are in pairsl when one brings something up, another brings something down antagonists (biceps/triceps) Muscles need bone to apply and direct the force generated skeletons o Types of skeletons Hydrostatic Exoskeleton Endoskeleton [Read / Know skeletal systems p730-731] Specific actions o Flexion – decrease angle of joints (p. 740 fig 38-11] o Extension – increase angle of joints When biceps cotract triceps relax Muscles have origin and insertion points Abudction/Adduction o Abduction – move away o Adduction – bring back towards middle Protaction/retraction o Protraction –Move forwards o Retraction – Take away Pronation/Supination o (pronate vs supine) Pronate (palm downwards) Supine – palm upwards B) Skeletal muscle (skeletal vs. cardiac vs. smooth muscle) Muscle cell comparison o Skeletal: elongated cell, voluntary, multiple peripheral nuclei, cisible stration o Cardiac: brancing cell; single central nucleus involuntary visible striation; gap junctions between cells o Smooth: spindle-shaped cell; single central nucleus, lack visible striation, involuntary
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Anatomy of a “Muscle” o o Muscle fiber (same as muscle cells)
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This note was uploaded on 11/09/2011 for the course BIO 102 taught by Professor Brey during the Spring '08 term at Rutgers.

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Musculoskeletal system - I) Musculoskeletal system a....

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