Muscular System

1. these muscle fibers are very resistant to fatigue & are capable of prolonged, sustained contractions
5. alternating light & dark protein bands found in some muscle tissues
8. this type of muscle tissue is located in the walls of hollow internal structures such as blood vessels, airways, the stomach, & the intestines
12. when muscle tissue contractions & relaxations are not under conscious control
13. the branch of medical science concerned with the prevention or correction of disorders of the musculoskeletal system
15. extra oxygen that is consumed at rest after a period of exercise to pay back the oxygen that was used to provide energy during activity; also known as recovery oxygen uptake
16. the name for a muscle that is damaged and lost its tone
17. the cells that compose skeletal muscle
19. an electrical signal that stimulates a muscle contraction
20. these muscle fibers have very little resistance to fatigue and are used for intense movements of short duration
22. a brief contraction of all of the muscle fibers in a motor unit in response to a single action potential in its motor unit
23. when muscle tissue contracts & relaxes by conscious control
24. these muscle fibers have a moderate resistance to fatigue

2. process that provides energy without using oxygen
3. an involuntary sustained muscle contraction that helps to keep muscles firm but not producing movement; this is what allows postural muscles to do their job without active muscle contractions to keep us upright
4. the cytoplasm of a muscle fiber
6. extension of muscle tissue that functions as an attachment for muscle to bone
7. the inability of a muscle to contract forcefully after prolonged activity
8. basic functional unit of striated muscle fibers
9. the scientific study of muscles
10. process that requires oxygen to provide energy
11. the connection point between a motor neuron and a muscle fiber
14. reddish pigment that gives skeletal muscle its color & stores oxygen until it is needed by the cell
18. this type of muscle tissue is attached to bones & moves parts of the skeleton
21. this type of muscle tissue is found only in the heart and forms the bulk of the heart wall