Muscular System

3. This movement is a combination of flexion, extension, abduction, and adduction.
4. A filamentous network of proteins that form a structure for the attachment of myosin filaments.
7. This movement is to bend.
11. This type of myofilament is thick and is arranged in an overlapping pattern that produces striations.
12. This cellular organelle is found in muscle fibers.
14. This type of rotation is away from the midline of the body.
15. This type of rotation is towards the midline of the body.
17. This is part D on the diagram.
19. Skeletal muscles are connected to bones by this tough connective tissue.
20. This is part A on the diagram.

1. This is part B on the diagram.
2. This is part C on the diagram.
5. This type of myofilament is thin and is arranged in an overlapping pattern that produces striations.
6. Skeletal muscle cells are filled with these tightly packed filament bundles.
8. As part of the myosin heads, they can bind to active sites on the actin molecules to form this.
9. This movement is to stretch out.
10. This movement is toward the midline of the body.
13. When a neuron is stimulated, this neurotransmitter is released that results in an impulse (action potential) in the cell membrane of the muscle fiber.
16. This movement is away from the midline of the body.
18. In muscle fibers, two Z lines and myofilaments between them make up this unit.