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Across 3. Connective tissue lying just under the skin which insulates the body and stores fat and water 5. Cytoplasm of muscle cells 6. Ability to transmit a nerve impulse from one place to another 8. Ability of a muscle to respond to a stimulus 12. Ability of a muscle to return to its original shape and size after contracting or stretching 13. Connective tissue lining the body walls and groups of muscles and allows free movement of muscles 14. Ability of a muscle to stretch 15. Connective tissues which connect muscles to bone 18. Ability of a muscle to contract 23. Light band within a sarcomere 26. Myofilament found within the A band and is made of myosin 27. Muscle cells 29. Broad sheet of connective tissue which joins two or more muscles together or to a bone 31. Myofilament found within the I band and partially in the A band, made of actin, troponin, and tropomyosin 32. Connective tissue surrounding a group of fascicles 33. Connective tissues which connect bone to bone 34. Smaller contractile units of a myofibril, actual functional unit of the muscle fiber

Down 1. Protein on the thin filament which covers the myosin binding sites on actin 2. Smooth ER which regulates calcium levels for muscle contraction 4. Folds within the cell membrane which connect sarcoplasmic reticulum to each other in order to synchronize muscle contractions 7. Protein of the thin filament which acts as a calcium binding site 9. Dark band within a sarcomere 10. Protein with a rod-like tail and two globular heads which comprises the thick filament 11. Protein which forms the body of the thin filament 16. The globular heads of the myosin which link thick and thin filaments together during muscle contraction 17. Rod like super-organelles found in myofibers 19. Red pigment, found only in muscle cells, which stores oxygen 20. Two structures within the sarcomere which cause the appearance of the light and dark bands 21. General term for broad sheets of connective tissue 22. Dark midline within the Iband of a sarcomere 24. Connective tissue surrounding a fascicle 25. Connective tissue surrounding a single myofiber 28. Lighter area within the A band of a sarcomere 30. Protein which attaches the myosin to the Z disk and aligns the thick and thin filaments and aids recoil after contaction