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Across 1. contractile unit of a muscle fiber; organized into Thick filaments and Thin filaments 4. a cord-like structure 5. no conscious control 6. ______ is attained due to a muscle moving an attached bone 7. the attachment to an immovable bone 8. with conscious control 9. specialized smooth endoplasmic reticulum (2 Words) 11. myofilaments are able to slide past each other during contractions; the muscle shortens (2 Words) 12. covers the entire skeletal muscle 14. on the outside of the epimysium 17. around a single muscle fiber 18. bundles of myofilaments 19. around a fascicle (bundle) of fibers

Down 2. sheet-like structure 3. tension in the muscle increases; the muscle is unable to shorten (2 Words) 10. a type of muscle that has striations; usually has a single nucleus;involuntary; found in the heart (2 Words) 13. specialized plasma membrane 15. attachment to a movable bone 16. a type of muscle that has no striations; has spindle-shaped cells; single nucleus; involuntary; found mainly in the walls of hollow organs