4 The triceps brachii is the main muscle that causes extension of the elbow. Insertion As indicated by its name, the quadriceps femoris has _ origins. Perimysium When a muscle contracts, its attachment point, called its _, is pulled towards its origin. EpimysiumĮndomysium Where is perimysium found? Around individual muscle fascicles Name the connective tissue layer that separates a skeletal muscle into fascicles. Thin Correctly list, from superficial to deep, the connective tissue layers associated with a skeletal muscle. Perimysium What are myofibrils? Bundles of proteins in a muscle cell What are tendons? Bands of dense connective tissue that attach skeletal muscles to bones Which muscle type has multinucleated cells that are cylindrical in shape? Skeletal muscle Intertwined strands of actin make up part of the _ filaments. Epimysium- Entire muscle, Endomysium- Muscle fiber, Perimysium- Fascicle Name the connective tissue layer that separates a skeletal muscle into fascicles. Epimysium Match the connective tissue layers with the structures they surround. Aponeuroses The layer of connective tissue that most closely surrounds an entire skeletal muscle is called the _. Tropomyosin Troponin and tropomyosin are associated with that other protein within the muscle fibers? Actin What is fascia? Dense connective tissue surrounding and separating muscles A broad sheet of fibrous connective tissue that attaches a muscle to aonnective tissues of adjacent muscles is called a(n) _. Troponin, Actin, Tropomyosin The organization of the thin and thick filaments within a muscle cell results in the formation of what muscle feature? Striations What are thin filaments composed of? Two intertwined strands of actin Binding sites for the myosin heads (cross-bridges) are found on the which of the proteins found within the thin filaments? Actin Name the long rod-like protein that sets in the longitudinal grooves along the thin filaments. Myosin List the three components of thin filaments. Elongated cells, Multinucleated, Cylindrical shape What term is used for the plasma membrane of a muscle fiber? Sarcolemma The thick filaments are composed of _ proteins. Tendons Indicate three characteristics of skeletal muscle fibers. Fiber Dense connective tissue cords that anchor muscles to bone are called _. Myofibrils Due to their shape, muscle cells are also called muscle _. Fibers What are tendons? Bands of dense connectie tissue that attach skeletal muscles to bones Long bundles of contractile proteins found in the sarcoplasm are called _. Endomysium What are myofibrils? Bundles of proteins in a muscle cell Due to their shape, muscle cells are also called muscle _. Fascicles Name the connective tissue layer that surrounds individual muscle fibers within a muscle. tendons A bundle of skeletal muscle fibers enclosed by a perimysium forms a(n) _ within a muscle. Muscular Dense connective tissue cords that anchor muscles to bone are called _. Hyper- What root word means between? Inter- What is the meaning of the word root iso- (as in isotonic)? Equal What are the two major protein types found in myofibrils? Myosin, actin The biceps brachii is an organ of the _ system. Transverse (T) tubules What structures are positioned between adjacent cisternae of the sarcoplasmic reticulum? Transverse tubules The prefix _ means over or more. Name the invaginations of the sarcolemma that extend through the muscle fiber. True- Cisternae are enlarged (dilated) areas of the sarcoplasmic reticulum. Transverse tubules True of false: The transverse tubules are located between structures called cisternae. Numerous openings in the sarcolemma of a muscle fiber lead down into structures called the _.
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