Muscles

6. time between stimulus and contraction
8. dark band of the muscle sarcomere that corresponds to the thick myosin filaments
10. mostly fast fibers, pale
11. alternate dark and light bands found on skeletal and cardiac muscle
12. response of a single muscle fiber to a brief stimulus
14. stores oxygen in muscle cells
15. long thin fibers that function in the movement and support of the cell
16. thin filament
18. acts as an energy reserve in muscle tissue
19. only actin
21. increased force of contraction by a skeletal muscle fiber when a twitch occurs before the previous twitch relaxes
23. mostly slow fibers, dark
25. when the myosin heads interact with thin filaments during a contraction
26. thick filament

1. temporary lack of oxygen in the muscle due to exertion
2. specialized endoplasmic reticulum of muscle cells
3. dark thin protein band to which actin filaments are attached in a striated muscle fiber, marking the boundaries between adjacent sarcomeres
4. begins with the release of crossbridges
5. only myosin
7. contractile unit of a muscle fiber
9. set of tubules that traverse the skeletal muscle, conduct the action potential deep into the cell and stimulate the sarcoplasmic reticulum to release calcium ions
13. time when tension is increasing
17. high energy storage compounds found in muscular tissue
20. complex protein formed by the crossbridge of actin and myosin
22. tightly packed filament bundles found within skeletal muscle fibers
24. sustained muscular contraction resulting from a rapid series of nerve impulses