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Muscular System (Types of Muscles (External Obliques (Origin- Lower eight…
Muscular System
Types of Muscles
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Erector Spinae
Origin- Iliac crests, ribs 3-12, and vertebrae
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Pectoralis Major
Origin- Sternum, clavicle, and first to sixth ribs
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Sliding Filament Theory
- Myosin attaches to actin, forming actin/myosin crossbridges
- Myosin head moves toward M line of sacromere, pulling actin filaments past myosin
- CA++ binds to actin, forming actin, exposing the myosin binding site
- This action is repeated many times powdered by ATP
- Nerve impulse or cation potential travels down sarcoemma and into T-tubules, causing sarcoplasmic reticulum to release CA++ into sacroplasm
- Z line get closer together as actin and myosin filaments past each other, and sacromeres shorten shortening the entire myofibril
Types of Muscle TIssue
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Skeletal
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Cells are long, cylindrical, parallel, and multinucleated
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