1							2
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	4			5												6						7
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9																								10
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13																				14						15
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			21
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	23
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			26
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			29							30								31
			32		33											34
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41												42
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Across 4. Strength given by organic component of bone (7) 8. Unit stretching from one Z line to next (9) 9. Bone in hand (6) 10. A protein in the thin filaments in muscle (5) 11. A structure made of collagen fibres that holds bone to muscle (6) 13. Fused vertebrae (6) 17. A protein in the thin filaments in muscle (11) 18. Type of bone that makes up outer layer of limb bones (7) 21. Plasma membrane of a muscle cell (10) 22. Major component of cartilage (5) 23. Type of striated muscle (7) 25. Fused vertebrae (6) 26. Muscle attached to humerus and ulna (10) 27. Secreted by osteblasts (7,9) 29. Five digit limb (11) 31. Conversion of cartilage to bone during development (12) 32. A cell that helps break down bone (10) 35. Function of skeleton (7) 36. A muscle whose contraction causes bending at a joint (6) 37. Type of joint at knee (5) 39. Type of striated muscle (8) 40. A protein in the thin filaments in muscle (8) 41. Type of joint enclosed by capsule (8) 42. Vertebrae that support lower back (6) 43. Infolding of the sarcolemma (1,6) 44. Bone in foot (6)

Down 1. A protein in the thick filaments in muscle (6) 2. One of many structures found inside a muscle fibre (6) 3. A structure made of collagen fibres that holds bone to bone at joints (8) 5. Shoulder blade (7) 6. Movement of organism from one place to another (9) 7. A muscle whose contraction causes straightening at a joint (8) 12. A pair of muscles where the contraction of one pulls in the opposite direction to the contraction of the other (12) 14. Type of cartilage found at ends of bones (7) 15. A cell found in cartilage (11) 16. A cell that helps form bone (10) 19. Vertebrae that support head and next (8) 20. A unit of bone structure in which osteocytes are arranged in concentric circles (9,6) 23. Load-bearing part of vertebra (7) 24. Secreted by osteblasts (13) 25. A space containing a cytoplasmic extension of a osteocyre (11) 28. Strength given by inorganic component of bone (11) 29. Function of skeleton (10) 30. Collar bone (8) 33. Vertebrae that support chest (8) 34. Place where two bones meet (5) 38. Space in bone once occupied by ostecyte (6)