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Muscle System

TermDefinition
Epimysium A sheath of fibrous elastic tissue surounding a muscle
Perimysium The sheath of connective tissue surrounding a bundle of muscle fibers
Endomysium The delicate connective tissue surrounding the individual muscular fibers within the smallest bundles.
Tendon A flexible but inelastic cord of strong fibrous collagen tissue attaching a muscle to a bone.
Muscle Fibers Any of the elongated cells characteristic of muscle.
Myoblast A myoblast is a type of embryonic progenitor cell that differentiates to give rise to muscle cells.
Sarcoplasm the cytoplasm of striated muscle cells.
Transverse Tubules transverse tubule is a deep invagination of the sarcolemma, which is the plasma membrane of skeletal muscle and cardiac muscle cells.
Action Pontential the change in electrical potential associated with the passage of an impulse along the membrane of a muscle cell or nerve cell
Myofilaments Myofilaments are the filaments of myofibrils constructed from proteins. The principal types of muscle are striated muscle, obliquely striated muscle and smooth muscle.
Thin Filaments made of the protein actin
Thick Filaments Made of the protein myosin
Sarcoplasmic Reticulum A membranous structure surrounding each myofibril
Triad is formed by 1 T tubule and 2 Terminal cisterna
Cisternae Concentrate Ca2 (via ion pumps) Release Ca2 into sarcomeres to begin muscle contraction
Sarcomeres a structural unit of a myofibril in striated muscle, consisting of a dark band and the nearer half of each adjacent pale band.
Myofibrils any of the elongated contractile threads found in striated muscle cells.
Striated muscle tissue in which the contractile fibrils in the cells are aligned in parallel bundles, so that their different regions form stripes visible in a microscope. Muscles of this type are attached to the skeleton by tendons and are under voluntary control
Troponin a globular protein complex involved in muscle contraction. It occurs with tropomyosin in the thin filaments of muscle tissue.
Tropomyosin a protein involved in muscle contraction. It is related to myosin and occurs together with troponin in the thin filaments of muscle tissue.
Active Site a region on an enzyme that binds to a protein or other substance during a reaction.
Actin a protein that forms (together with myosin) the contractile filaments of muscle cells, and is also involved in motion in other types of cells
Myosin a fibrous protein that forms (together with actin) the contractile filaments of muscle cells and is also involved in motion in other types of cells
Neuromuscular Junction A neuromuscular junction is a synapse between a motor neuron and skeletal muscle. This lesson describes the events of synaptic transmission leading to contraction of skeletal muscle
Sarcolemma the fine transparent tubular sheath that envelops the fibers of skeletal muscles.
Created by: colleenjs13
 

 



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