Muscle Crossword

4. A bundle of muscle fibers that are surrounded by connective tissue
6. The synapse that connects a motor nerve to a muscle fiber
9. It is the repeating unit between two Z-lines
10. A chemical messenger that transmits signals between neurons and other cells in the body
13. Cylindrical organelles that make up the majority of a muscle fiber's volume
15. A flexible but inelastic cord of strong fibrous collagen tissue attaching a muscle to a bone
18. A thick layer of connective tissue that surrounds the entire muscle
19. The ability of a deformed material body to return to its original shape and size

1. The ability of cells to respond to stimuli
2. Thick fiber protein
3. A protein that forms filaments that provide structure and movement to cells
5. The ability of a substance or body to shrink, shorten, or become narrower
7. The connective tissue layer that surrounds and separates bundles of muscle fibers within a skeletal muscle
8. The ability to be extended or stretched
11. A group of muscle fibers and a motor neuron that work together to create skeletal muscle contractions
12. A dark band in a muscle cell that contains thick myosin filaments and some thin actin filaments
14. A region in the middle of a sarcomere, a part of a muscle cell, that contains only thick filaments and no thin filaments
16. A thin layer of connective tissue that surrounds each muscle fiber
17. A dense line in muscle tissue that defines the boundary of the sarcomere
20. A lighter band of skeletal muscle that contains actin filaments