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Across 1. Skeleteal Muscles are also called _______ muscles. 3. inner material surrounding fibers (like cytoplasm) 5. Involuntary muscles are ___________ muscles. 6. Individual muscles are separated by ... which also forms tendons and aponeuroses 10. connective tissue around a bundle of muscle fibers 11. A type of fiber that contains hundreds or even thousands of myofibrils 12. connective tissue around a muscle 15. Between two Z lines 17. The heart is what type of muscle 18. Connective tissue around a muscle cell 19. muscles enlarge (working out or certain disorders) 20. Thick, protein filaments 21. Sustained contraction of individual fibers, even when muscle is at rest 22. The muscle fiber + the motor neuron 23. a sustained involuntary contraction

Down 1. muscle fiber membrane 2. Make up the contractile components in the muscles 4. The immovable end of the muscle 6. Groups of muscle fibers 7. Thin, protein filaments 8. The moveable end of the muscle 9. Muscles are composed of many fibers that are arranged in bundles called 13. more and more fibers contract as the intensity of the stimulus increases 14. A energy source provided by ATP from cellular respiration 16. muscles become small and weak due to disuse