Muscle Physio-26

Muscle Physio-26 - Chapter 26 Muscle Physiology Muscle...

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Chapter 26 Muscle Physiology
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Muscle activity The muscle contraction is dependent of: l Electrical excitation of a muscle cell l Excitation-contraction coupling l Sliding of the myofilaments
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Action potential l Resting membrane potential ¡ -60 to -90 mV ¡ K concentration ¡ Na concentration l Depolarization l Action potential l Repolarization ¡ Absolute refractory period ¡ Relative refractory period
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l Cyclic process beginning with calcium released from SR l Calcium binds to troponin l Changes in troponin shape l Tropomyosin uncovers active site on actin l Actin forms cross-bridges with myosin l Slinding of myosin and actin over each other Muscle contraction
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Muscle contraction l Muscle shortens l Ending of action potential l Calcium is reabsorbed by sarcoplasmic reticulum l Myosin detaches from actin l Muscle is in resting stage again
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Muscle Contraction
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Muscle contraction
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Muscle Contraction
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l Twitch ¡ Cycle of contraction, relaxation produced by a single stimulus ¡ Phases l Latent period
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Muscle Physio-26 - Chapter 26 Muscle Physiology Muscle...

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