Muscular System

2. feather
5. movers are muscles causing the desired action
7. muscles have a rounded fiber arrangement
8. refer to body positions maintained by muscle contractions. Ex. Sitting and standing
10. muscles have fibers joining at one end with fibers spreading out like a fan at the other end
12. cell membrane surrounding muscle fibers. Folds in the sarcolemma are called motor end plates, which are where muscle fibers receive signals to contract from their associated motor neutrons.
14. together, work
15. towards the middle
16. muscles twist between their points of attachments.
18. away from the middle
19. muscle
20. specialized synergists that stabilize joints or help maintain posture so prime movers can exert their action
21. same or equal measure

1. or muscle cells, have a distinct threadlike shape and often run the length of the muscle. Also contain multiple mitochondria and nuclei
2. muscles have their fibers arranged along the long axis of bone and usually tapered at both ends or are spindle shaped.
3. strong central structural unit or band
4. Muscle contractions produce heat – this mechanism is called thermogenesis and maintains the body's temperature.
6. same or equal tension
9. intracellular fluid within the muscle fibers and is equivalent to cytoplasm in typical cells.
11. lacking, without, not; to grow
13. muscle fibers contain thousands of slender strands called myofibrils. They lay side to side and run the length of each muscle fiber.
14. flesh
17. to struggle against
22. Skeletal muscles contract to pull on bones, producing movement. There are approximately 640 skeletal muscles in the body. Contraction of skeletal muscles also promotes the movement of blood and lymph.