Muscle Lecture 1 Notes-1

Muscle Lecture 1 Notes-1 - Lecture 10 Muscle Lecture Part 1...

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Lecture 10 Muscle Lecture Part 1 Functions of Skeletal Muscle-on slide Support soft tissues (especially abdomen) Guard openings (sphincters) Body temp (muscle contractions produce heat) Brachioradialis muscle on next slide bundles of muscle fibers inside sheath. Fibers are chains of muscle cells, up to 30cm long Muscle fibers are made of myofibrils, made of contractile myofilaments **Sarcomere is the structural and functional unit of muscle runs from one z band to another Image of structural hierarchy of muscles (drew sacromere on board) Myosin can interact with 6… Actin can interact with 3… (on slides) The head of myosin is a ratchet, and ATP is involved in attaching the heads around the actin (I think. .) Thin Filament Structure-tropomyosin band lies across binding sites (read slide about Ca absence) For muscle contraction to occur, need: 1. Calcium. (binds to troponin and changes shape and pulls off of binding sites on actin and makes available for myosin to bind to) Slide shows relaxed v. shortened muscle, pulling actin in toward myosin…a band length
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Muscle Lecture 1 Notes-1 - Lecture 10 Muscle Lecture Part 1...

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