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Study Questions Skeletal Muscle Tissue 1. What is the main function of skeletal muscles? Movement 2. List the three types of contractile cells of the body. Smooth muscle cells, Cardiac muscle cells, Skeletal muscle cells 3. Match the following types of contractile cells to their shape (branching, elongated, spindle-shaped): _____elongated______________ a. Skeletal muscle cells _____branching______________ b. Cardiac muscle cells _______spindle-shaped_______ c. Smooth muscle cells 4. Match the following types of contractile cells to the characteristics of their nuclei and presence or absence of striations: Cardiac Muscle Cells Smooth Muscle Cells Skeletal Muscle Cells ____Cardiac muscle_______________ a. presence of visible striations & single, centrally-located nuclei ___skeletal muscle________________ b. presence of visible striations & multiple peripheral nuclei _____smooth muscle_________ c. absence of visible striations & single, centrally-located nuclei number of nuclei 5. What is the name of the structure that attaches skeletal muscles to bones? tendon 6. Bundles of skeletal muscle cells are called __fascicles______________. 7. The connective tissue which immediately surrounds a muscle is called ___epimysium____________ and the connective tissue around the fascicles is called _____perimysium___________. 8. What is the function of endomysium? wraps individual cell fibers 9. Match these terms to their description: Triad T tubules Terminal cisternae Sarcolemma Muscle fibers Mitochondria Sarcoplasmic reticulum Myofibril _terminal cisterna_ a. Sac-like regions of the sarcoplasmic reticulum that contain calcium ions. _____mitochondria_____ b. Sites of ATP synthesis. __sarcolemma_____ Muscle fiber________ c. Plasma membrane of the muscle cell. d. Alternative name for skeletal muscle cells. Sarcoplasmic reticulum e. Interconnecting tubules of endoplasmic reticulum that surround each myofibril. ____Triad_________ f. A group of one T tubule lying between two adjacent terminal cisternae. ___T-tubules__________ g. Invaginations of the projecting deep into the cell. __Myofibril_______ sarcolemma that h. Contains the contractile filaments within the skeletal muscle cell. 10. What are the names for the two types of filament in a myofibril? Actin and Myosin 11. What creates the skeletal muscle cell's striated appearance? The arrangement of thick (myosin ) and thin (actin) filaments form light and dark bands. Myosin dark band actin light band 12. Match the following: A band I band H zone _____I band_________ a. Contains only thin filaments. _____A band_________ b. Contains only thick filaments. ______H zone________ c. Contains both thin and thick filaments. 13. Perpendicular to the myofilaments are the Z lines and the M lines. The Z lines connect the ____thin_________ filaments and the M lines connect the ____thick _________ filaments. 14. The region of the myofibril between two Z lines that is the contractile unit of a muscle cell is called a __Sarcomere___________ . 15. Arrange the following from smallest structure to largest structure: Muscle cell or muscle fiber 3 Fascicle 4 Myofilaments 1 Whole skeletal muscle 5 Myofibril 2