HAN 200 Lecture Notes - Lecture 10: Striated Muscle Tissue, Skeletal Muscle, Muscular System
6 Aug 2018
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When skeletal muscle contracts: one bone of joint remains stationary while other is pulled. Origin: attachment of muscle"s tendon to stationary bone. Insertion: attachment of muscle"s tendon to movable bone b. c. d: muscle attachment sites: origin & insertion, how skeletal muscle produces movement: lever systems a. b. In movement, bones act as levers: a rigid structure that moves around a fixed point (fulcrum) A lever is acted on at two different points by two different forces: i. ii. effort: causes movement load (resistance): opposes movement c. d. Mechanical advantage: load is closer to the fulcrum than the effort. Mechanical disadvantage: load is farther from the fulcrum than the effort: lever system, classifications of levers, three types of levers based on positions of the fulcrum, the effort and load i. ii. First-class levers: fulcrum is between the effort and the load: example: scissors, seesaws. Second-class lever: the load is between the fulcrum and the effort: example: wheelbarrow iii.
