MOVESCI 110 Lecture Notes - Lecture 21: Muscle Contraction, Resistance 3, Human Musculoskeletal System
17 Sep 2016
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Musculoskeletal system can be though of as a series of simple machines: serve to balance multiple forces, enhance force to overcome a resistance, enhance the speed of a movement so that resistance can be move farther (up. Rom: alter the direction of a force. Three types of machines in the body: wheel and axle (rotation motion, pulley (patella at the knee- alteration of direction of force, lever. A rigid bar that can rotate about a fixed point when a force is applied to overcome a resistance (seesaw) The resistance is often the weight of a body segment or the whole body, or an external weight. The force is almost always the force of a muscle contraction. Torque- causes levers to function (moment of force) The turning effect of an eccentric force (not eccentric contraction)
