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Unformatted text preview: 11-7-07 anatomy notes1.Muscular Systema.Ultrastructure of Skeletal Muscle Systemi.Sarcolemma (Plasma Membrane)1.plasma membrane of skeletal muscle cell2.can pass action potentialsii.Many peripheral nuclei (1000)1.under sarcolemma of sarcoplasm2.edge of sarcomereiii.Sarcoplasm (cytoplasm of skeletal muscle cell)1.mitochondria between myofibrilsa.ATP production is a VERY important function of mitochondriab.Myofibrils-contractile units of muscle cells elongated cylindersi.Composed of protein myofilaments (very large proteins, solid, protenatious in composition)1.arrangement of myofilaments produces cross-striations that are visiblea.bands2.Light Microscopic Levela.A-Bands and I-Bandsi.A-Bands: dark, designated b/c of the way that light comes thru them; Anisotropic is where the “A” comes fromii.I-Bands: light, designated b/c of the way that light goes through them; Isotropic (where “I” comes from)3.Electron Microscopic Structurea.Thick-myosin (protein)i.Has extensions-cross bridges...
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