ergo05_Compatibility_Mode_ - 23/03/1432 Safety and...

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Safety and Ergonomics 23/03/1432 Spring 2010/ 2011 1 Muscle ± Functions ² Maintain postural balance ² Cause local motion of body segments ± Paired muscle groups ² Agonistic and antagonistic ± Skeletal Muscles Æ striated, attached to bone via Spring 2010/ 2011 1 tendons in insertion and origin, belly shape Muscle ± Muscle Æ fibers Æ Fibrils Æ filaments Æ actin and myosin ± Muscle at relax ² Actin and myosin seperated by tropomysin and trponin ± Muscle at contraction ² tropomysin and trponin are pulled away Spring 2010/ 2011 2 ² Temporal Cross bridges connect actin and myosin ² Actin pull themselves along myosin
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Safety and Ergonomics 23/03/1432 Spring 2010/ 2011 2 Muscle ± Each nerve (axon end) is connected to a number of muscle Fiber (motor unit) Æ end motor plate ± Action impulse Æ depolarize at least 40mV ² If not Æ no react ² If yes Æ motor unit will contract completely ± Depolarization Æ ions permeability Æ end plate potential ² Depolarization wave move as electrical current Action potential Æ fibrils by Z discs Spring 2010/ 2011 3 ± Action potential fibrils by Z-discs ² Release calcium ions ± Form ATPase ± Binds to troponin and tropomysin Æ cross brifges are established Muscle ± Twitch ² Contraction ² Relaxation ² Recovery ± Rate code ² Time sequence in which signals arrive at a motor unit Spring 2010/ 2011 4 ± Recruitments ² Time sequence in which signals arrive at different motor unit
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ergo05_Compatibility_Mode_ - 23/03/1432 Safety and...

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