Movement

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5       6           7     8     
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  12                    
13              14          
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      18      19     20         
                    
                    
         21             
                    

Across:

1. Framework of bones that protects and supports the body. (8)
3. Type of joint that allows movement in three planes. (4,3,6)
6. One of 33 bones that make up the backbone. (8)
7. Tissue attached to bones that produces movement. (6)
10. Term used to describe a pair of muscles that produce movement in opposite directions. (12)
13. Strong smooth slippery material that cushions the ends of bones. (9)
14. Upper arm bone. (7)
16. Tough fibrous material that attaches bones to bones. (8)
17. Outer and shorter of the two lower arm bones. (6)
18. Point where two bones meet. (5)
21. Type of joint that allows movement in one plane only. (5)

Down:

1. Liquid that lubricates joints. (8,5)
2. Inner and longer of the two lower arm bones. (4)
4. Upper bone of the leg. (5)
5. Collar bone. (8)
8. Chemical element found in milk needed for the formation of healthy bones. (7)
9. Shoulder blade. (7)
11. Flexor muscle in the upper arm. (6)
12. Extensor muscle in the upper arm. (7)
15. Tough material which connects muscle to bone. (6)
19. Shinbone. (5)
20. Main component of the human skeleton. (4)