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Across 6. contract spontaneously at regular intervals 8. type of respiration that doesn't use oxygen 11. muscles of respiration are found here 12. proteins in the myofibrils 16. standing on your tiptoes 18. can recoil to original resting length after being stretched 19. respond to a stimulus 22. move body part anteriorly 23. cardiac muscle propels this fluid 25. move body part inferiorly 28. skeletal muscles make up this percent of body weight 29. surrounds the muscle fiber 30. skeletal muscles maintain this, which allows us to sit up straight 31. surrounds a bundle of muscle fibers (fasciculi) 34. thin myofilaments 35. smooth muscles constrict the walls of _____ organs 36. smaller band in middle of A band, consists of only H zone 38. another word for contraction 39. more body part laterally 41. connective tissue that surrounds the body or individual muscles or groups 44. skeletal muscles are under this type of control 45. dark band in middle of H-zone 47. move body part superiorly 48. type of neurons that stimulate muscles to contract 49. threadlike structure made of myofilaments 50. thick myofilaments 51. most efficient way to produce heat

Down 1. extends length of myosin 2. cytoplasm inside the muscle fiber 3. smooth muscle cells have this shape 4. decrease in size of muscle fibers 5. a bundle of muscle fibers 7. speaking, typing, expressions 9. disks found in cardiac muscle 10. increase angle at joint 13. can be stretched to normal resting point and beyond 14. decrease angle at joint 15. move body part posteriorly 17. increase in size of muscle fibers 20. muscles will lengthen ____ after they forcefully contract 21. surrounds the many fasciculi (entire muscle) 24. highly organized contractile unit 26. move soles laterally 27. system that controls smooth and cardiac muscle 32. plasma membrane of the muscle fiber 33. skeletal muscles release heat when they do this 37. place within sacromere where actin attaches 39. move body part back to midline 40. includes zdisk, consists of only actin 42. move soles to the midline 43. respiration that required oxygen 46. muscle type with the most variety