Muscle Mechanics - Muscle Mechanics 26/03/2008 10:03:00...

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Muscle Mechanics 26/03/2008 10:03:00 Single muscle Cell which is ‘good at movement’ Muscle twitch Tetanic contraction Contraction arising from single stimulus o Action potential Tension in muscle builds suddenly and then goes away Three phases o Latency Originally believed to be an error Gap between stimulus and reaction of muscle Started by action potential Signals release of calcium ‘Anticipation’ Comparatively short Potential sweeps sarcolema Release of Calcium from sarcoplasmic reticulum o Contraction Muscle actually contracts Calcium binds to troponin Exposure of myosin binding sites Cross-bridge formation Occurs at different speeds in different muscles Different strengths o Relaxation
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Longer than all other periods Uptake of calcium into the SR Binding sites are covered Cross-bridge heads detach Characteristics of muscles o Quick muscles ‘fast-twitch’ Eye muscles o Progressively slow
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This note was uploaded on 04/03/2008 for the course PSIO 201 taught by Professor Stanescu during the Spring '08 term at University of Arizona- Tucson.

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Muscle Mechanics - Muscle Mechanics 26/03/2008 10:03:00...

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