Bio 133- Chapter 6

2. A somatic motor neuron and all the muscle cells that it stimulates
4. chemical released by nerve cells that has either an excitatory or inhibitory effect on another excitable cell
8. Thick filaments composed of a protein
11. A contractile protein of muscle
13. T tubules are in close contact with a series of membrane-bound chambers called
14. is defined as a decline in muscle performance during exercise
15. A segment of a myofibril from one Z-line to the next

1. Increasing muscle cell force by increasing the rate of stimulation of motor units is called
3. The junction between a motor neuron and a skeletal muscle cell is called the
5. Increasing tone (or force) by activating more motor units is
6. muscle cells are completely under the control of their motor neuron
7. Skeletal muscle cells are stimulated to contract by certain nerve cells
9. Muscles contract when sarcomeres shorten, and sarcomeres shorten when the thick and thin filaments slide past each other
10. Muscle cells always respond with a complete cycle of contraction and relaxation
12. defined as a decline in muscle performance during exercise