Muscular System

3. What area of the sarcomere stays the same width during contraction? (no space)
5. Type 2x skeletal muscle, with quick contraction and low mitochondria (2 words, no space)
8. What type of muscle is smooth muscle tissue, referring to the lack of bands?
9. Actin, troponin, and _____ form the thin filament.
11. In skeletal muscle, Ca++ is stored in the ______ (2 words, no space)
12. As motor unit size increases, precision ______.
14. What kind of muscle is striated and involuntary?
15. Which kind of muscle is voluntary?
17. Single-unit smooth muscle is capable of ______ activity.
19. When a muscle cannot maintain tension, it is called neuromuscular _______
23. Degrades acetylcholine from the NMJ.
24. The exact center of a sarcomere
25. A neuron and all muscle fibers it innervates (2 words, no space)

1. What transmits action potentials through smooth muscle tissue, between the cells? (2 words, no space)
2. The space where a neuron joins a muscle cell (2 words, no space)
4. What happens to muscles after death, when no ATP is left over?
6. What is the first source tapped for ATP in muscles? (2 words, no space)
7. A section of membrane that propagates the action potential into the muscle.
10. What does Ca++ bind to in smooth muscle to initiate contraction?
11. What is the smallest contractile unit of a skeletal muscle?
13. _____ Summation is the increase in tension due to repeated stimulation of a muscle fiber
16. ATP allows myosin head and actin to ______.
18. Which chemical transmits the action potential to the motor end plate?
20. The thick filament is composed largely of what molecule?
21. The outer boundary of a sarcomere is called the _____. (no space)
22. What binds to troponin to expose the cross-bridge binding site?