Lecture 5 - Musculoskeletal System Muscle Action Skeletal...

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Musculoskeletal System Muscle Action Skeletal Muscles Anatomy Contraction Control of Contractions Whole Muscle Action Sarcoplasmic Reticulum contains the Ca+ iv. Sarcoplasmic reticulum becomes permeable to Ca++ --start contraction v. End contraction: --Ca++/ATPase Pump -energy requiring -picks up Ca++ and returns it to the Sarcoplasmic Reticulum Summation and Tetanus (Fig 39-13, pg. 841) --single twitch—1 tension --twitch summation—addition of tensions --Tetanus-continuous stimulation-sum multiple impulse effects —much greater tension exerted ATP Needed Twice: 1. Energize myosin head + release myosin from actin 2. Ca++/ATPase pump Creatine Phosphate --molecule in skeletal muscle that stores a little bit of energy --used when just about out of ATP
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Rigor Mortis --rigor of body at point of death --body stiffens after body dies (has to do with muscle) --at point of death sarcoplasmic reticulum becomes permeable --Ca++ diffuses out and goes to truponin --truponin moves tropomyosin out of the way --muscle gets stuck
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Lecture 5 - Musculoskeletal System Muscle Action Skeletal...

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