Muscular System

4. muscle attachment site that doesn’t move in contraction
6. light bands made up on actin filaments, which r anchored to z lines
7. a highly organized tissue composed of bundles of muscle fibers called myofibers which contain several myofibrils
13. broad sheets of connective tissue that connect muscles to each other
14. dark bands made up of overlapping thick and thin filaments
15. involuntary non-striated (lined) muscle
21. bands produced by organization of thick and thin filaments
23. cell membrane of a muscle fiber
25. muscle that opposes the action of another muscle
26. mainly composed of actin in myofibrils, but also troponin and tropomyosin
27. line in the center of the H zone that has the proteins that hold myosin filaments in place
28. muscle that assist the prime mover (agonistic muscle) in its role
29. boundary of the sarcomere in striated muscle
30. cytoplasm of muscle cell that contains many mitochondria and nuclei

1. organelle of a muscle fiber which are active in muscle contraction
2. consist of protein myosin in myofibrils
3. muscle group that provides the main pull to create movement
5. the endoplasmic reticulum of a muscle cell, a network of membranous channels that lies beneath the sarcolemma of a muscle fiber
8. main contractile unit of muscle fiber in skeletal muscle
9. Cardiac muscle is an involuntary striated muscle tissue found only in the heart and is responsible for the ability of the heart to pump blood.
10. layer of connective tissue around each skeletal muscle
11. a zone in the middle of the A band that only has myosin filaments
12. layer of connective tissue that covers each muscle cell (fiber)
16. layer of connective tissue that extends inward from the epimysium, surrounds bundles of skeletal muscle fibers (called fascicles) within each muscle
17. muscles that keep bones immobile when needed.
18. layers of dense connective tissue that surround and separate each muscle
19. a fibrous connective tissue that attaches muscle to bone
20. muscle attachment site that moves in contraction
22. cylindrical muscle cells
24. organs that use chemical energy from nutrients to contract and move attached structures