2E Muscular System

2E Muscular System - Biol 255 Unit 2E Skeletal Muscle...

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B. Krumhardt, Ph.D., GDCB 1 Biology 255 Unit 2E Muscular System B. Krumhardt, Ph.D. GDCB, Iowa State University Skeletal Muscle Movement of Bones • Generally one bone is stationary - origin • One moves - insertion Group Actions • Muscles work in groups • Prime mover or agonist - produces desired effect - contraction • Antagonist – relaxed, stretched as agonist contracts • Synergists - aid agonist, smooth movement • Fixator - holds the origin of agonist stable as it contracts Naming Skeletal Muscles • Location of muscle – bone or body region associated with the muscle • Shape of muscle – e.g., the deltoid muscle (deltoid = triangle) • Relative size – e.g., maximus (largest), minimus (smallest), longus (long) • Direction of fibers – e.g., rectus (fibers run straight), transversus, and oblique (fibers run diagonal to an imaginary defined axis) • Number of origins – e.g., biceps (two origins) and triceps (three origins)
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This note was uploaded on 10/14/2011 for the course BIOL 255 taught by Professor Staff during the Fall '08 term at Iowa State.

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2E Muscular System - Biol 255 Unit 2E Skeletal Muscle...

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