Chapter 12

2. The inability of muscle cells to relax that is due to high frequency stimulation
3. The structural and functional unit of skeletal muscle
5. Each fascicle of a muscle is surrounded by this
7. These structures carry the action potentials into the interior of the muscle to cause muscle contraction
8. This is characterized by continued attachment of myosin heads to actin filaments due to a lack of ATP
10. This type of contraction occurs against a resistance greater than the force of contraction and causes muscle lengthening
11. This is composed primarily of thick filaments
12. The prime mover of any skeletal movement
14. The more movable bony attachment

1. The movement of the troponin-tropomyosin complex requires this ion
2. This is also known as the staircase effect, and represents a warm up effect due to increasing intracellular calcium concentrations
4. Each somatic motor neuron with all the muscle fibers it innervates is known as this
6. This is the specialized region of the sarcolemma at the neuromuscular junction
9. The light band of a skeletal muscle
13. This protein primarily makes up the thick filament