Problem 4

4. A white fibrous cord of dense regular connective tissue attaches muscle to bone
7. located in the walls of hollow organs, involuntary, not striated
8. Muscle shorten, produces movement as enough force is generated
10. basic unit of muscle contraction
12. Threadlike structures extending longitudinally through a muscle fiber consisting mainly of thick filaments and thin filaments
15. the length of muscles remains the same while not enough tension is produced for movement
16. A layer of dense irregular connective tissues; separating them into bundles called fascicles
18. attached to bones and skin, voluntary, striated
19. located in the heart, involuntary, striated
20. an action that is under the control of the will

1. the length of muscle changes while the tension remains almost constant and movement is produced
2. a discrete bundle of muscle cells
3. contractile protein that makes up thick filament
5. outer layer, encircling the entire muscle
6. Regulatory protein that is a component of thin filament, when skeletal muscle fiber is relaxed
9. located in the heart, involuntary, striated
11. penetrates the interior of each fascicle and separates individual muscle fibers from one another.
13. Regulatory protein that is a component of thin filament, when calcium ions bind to troponin, it changes shape
14. A previously shortened muscle lengthens slowly as enough force is generated
17. cross-striations occur in the fibers as a result of regular overlapping of thick and thin myofilaments