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Anatomy Chapter 10

Skeletal Muscle

Skeletal Muscle: Terminology Fibers, myofilaments, myofibril, sacrolemma, and sacroplasm
Skeletal Muscle: Terminology: Fibers cells of skeletal and smooth muscle tissue
Skeletal Muscle: Terminology: Myofilaments -special type of microfilaments CONTRACTILE PROTEINS that shorten muscle cells -ACTIN and MYOSIN
Skeletal Muscle: Terminology: Myofibril -A complex ORGANELLE composed of bundles of myofilaments -Each muscle fiber contains 100 to 1000 of these than run parallel to its length -Account for 80% of cellular volume in a muscle cell
Skeletal Muscle: Terminology: Sarcolemma plasma membrane of the muscle cell
Skeletal Muscle: Terminology: Sarcoplasm -Cytoplasm of the muscle cell -GLYCOSOMES and MYOGLOBIN
Skeletal Muscle: Epimysium -"Outside the muscle" -An overcoat of dense irregular connective tissue that surrounds the entire muscle -May blend with deep fascia between muscles
Skeletal Muscle: Perimysium -"Around the Muscle" -Fibrous connective tissue that surrounds groups of muscle fibers call fascicles
Skeletal Muscle: Endomysium -"Within the muscle" -Fine sheath of connective tissue composed of reticular fibers surrounding each muscle fiber (cell)
Skeletal Muscle: Microscopic Anatomy Sacroplasmic Reticulum Definition -Interconnecting tubules of endoplasmic reticulum that surround each myofibril
Skeletal Muscle: Microscopic Anatomy Sarcoplasmic Reticulum Function -store and regulate intracellular levels of Calcium (Ca2+) -Calcium is released when a muscle fiber is stimulated to contract
Skeletal Muscle: Microscopic Anatomy Sarcoplasmic Reticulum: TERMINAL CISTERNAE -Sac like regions of the Sarcoplasmic Reticulum that contains calcium ions -perpencdicular to the myofibril
Skeletal Muscle: Microscopic Anatomy: Sarcomere - The smallest contractile unit within a myofibril -Aligned end to end along a myofibril
Skeletal Muscle: Microscopic Anatomy: Sarcomere: TITIN large protein in sarcomere that resists overstretching by holding the thick filament in place
Skeletal Muscle: Microscopic Anatomy: Sarcomere: Striation Pattern -Repeating series of dark A bands and light I bands
Skeletal Muscle: Sarcomere: Striation Pattern: A Band thick and thin filaments overlap
Skeletal Muscle: Sarcomere: Striation Pattern: I Band region with only thin filaments
Skeletal Muscle: Sarcomere: Striation Pattern: Z Line -defines the boundaries of each sacromere -where thin filaments from adjacent sacromeres attach
Skeletal Muscle: Sliding Filament Model of Contraction -Myosin heads bind to thin filaments and bend, then detach and repeat several times during contraction, acting like a ratchet to generate tension and propel thin filaments to the center of the sacromere -As this occurs in sarcomeres, THE MUSCLES SHORTE
Skeletal Muslcle: Sliding Filament Model of Contraction: Initiation -proces is initiated by the binding of calcium ions to the thin filaments and powered by ATP
Created by: vs604



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