muscular system proj.

2. muscle cell membrane
4. attachment of the muscle to the bone that moves
5. increase angle at a joint
7. sheath of connective tissue that surrounds an individual skeletal muscle fiber
8. moves insertion downward
14. contractile unit of a muscle fiber
17. covering of muscle
18. decrease angle at a joint
19. a protein in a muscle fiber, that together with myosin, is responsible for contraction and relaxation
20. neurotransmitter chemical released at the ends of nerve cells
21. attachment of the muscle to the bone that remains stationary
22. is found in the internal organs of the body such as digestive and respiratory systems and blood vessels and eyes
25. moves limb toward midline of body

1. sheath of connective tissue that encloses a bundle of skeletal muscle fibers
3. the structural and functional unit of a myofibril
6. a protein that, together with actin, is responsible for muscular contraction and relaxation
9. rotates bone along its axis
10. fibrous membrane covering supporting and separating muscles
11. bundle of muscle fibers
12. inflammation of a tendon
13. one of the contractile fibers found within muscle cells
15. moves insertion upward
16. cordlike or bandlike mass of white fibrous connective tissue that connects a muscle to a bone
23. allows muscles to return to its original shape
24. moves limb away from midline of body
26. become short and thick which causes movement