lecture 3-20 muscles - Chapter 49 (pp.1066-1072) Muscles...

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Chapter 49 (pp.1066-1072) – Muscles Learning objectives: • Explain the sliding-filament model of muscle contraction. • Explain how muscle contraction is controlled. • Explain how the nervous system produces graded contraction of whole muscles. • Know the characteristics of slow and fast muscle fibers. • Distinguish among skeletal muscle, cardiac muscle, and smooth muscle.
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Concept: Muscles move skeletal parts by contracting - The action of a muscle is always to contract Skeletal muscles are attached to the skeleton in antagonistic pairs each member of the pair works against the other Figure 49.27 Skeletal muscle structure is characterized by a hierarchy of smaller and smaller units Figure 49.28
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A skeletal muscle consists of a bundle of long fibers Running parallel to the length of the muscle A muscle fiber Is itself a bundle of smaller myofibrils The myofibrils are composed to two kinds of myofilaments 1. Thin filaments, consisting of two strands of actin and one strand of regulatory protein 2. Thick filaments, staggered arrays of myosin molecules
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lecture 3-20 muscles - Chapter 49 (pp.1066-1072) Muscles...

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