Ch. 10Muscle Tissue - 1 Muscular Tissue 2 Muscular Tissue...

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Unformatted text preview: 1 Muscular Tissue 2 Muscular Tissue Types: Skeletal Smooth Cardiac 3 Muscular Tissue Function: Produce body mvmt. Stabilizing body position Storing and moving substances within body Produce heat 4 Muscular Tissue Properties Electrical excitability Contractility Extensiblity Elasticity 5 Skeletal Muscle Tissue Structure: Body (belly) connected by tendons to the skeleton Tendons (collagen fibers) nearly avascular structure composed of a parallel arrangement of collagen fibers extension of three connective tissue layers ends of muscle 6 Tendon Muscle fibers are surrounded by endomysium. Muscle fascicles are surrounded by perimysium. Muscle bundles are surrounded by epimysium 7 Skeletal Muscle Tissue Muscle fibers < Multinucleate > form before birth last a lifetime. Muscle growth after birth hypertrophy (increased cell size) NOT hyperplasia (increased cell numbers) 8 Skeletal Muscle Tissue Anatomy Sarcolemma plasma membrane of a skeletal muscle fiber. T tubules extensions of the sarcolemma tunnel throughout the muscle fiber open to the outside and are filled with ISF Sarcoplasm cytoplasm of a skeletal muscle fiber 9 Skeletal Muscle Tissue Anatomy Myofibrils nonmembrane bound organelles extend the entire length of the muscle fiber. Sarcoplasmic reticulum (SR) stores Ca ++ until needed release of Ca ++ into the sarcoplasm couples electrical excitation to muscle contraction 10 11 Skeletal Muscle Tissue Muscular atrophy wasting of muscle due to the loss of myofibrils within muscle fibers Disuse atrophy atrophy from unused muscles reversible Denervation atrophy...
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Ch. 10Muscle Tissue - 1 Muscular Tissue 2 Muscular Tissue...

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