Muscle Cells Crossword Puzzle

2. the concept that a sarcomere shortens as the thick and thin filaments slide past one another
4. another name for cardiac muscle cells
9. muscles that appear to have parallel lines or stripes due to the sarcomeres; skeletal and cardiac
12. involuntary muscle found in many organ systems that control organs
14. filaments of connective tissue that surround cardiac muscle cells to insulate and help them keep their shape
16. muscle muscle that is under conscious control; skeletal muscle
17. involuntary muscle tissue found only in the heart.
18. a muscle that serves to bend a limb
19. muscle that is attached to the bones of the skeleton and provides the force that moves the bones.
21. specialized nerve cells that send signals from the brain and spinal cord to the muscles and cause them to contract or relax
22. another name for a muscle cell
23. muscle muscle that is not under conscious control, but controlled automatically by the brain; smooth and cardiac

1. tightly packed filament found within skeletal muscle fibers
3. the thin filaments of protein in a muscle fiber
4. the thick filament of protein in a muscle fiber
5. muscle pairs arranged to work against each other to move a joint
6. specialized cells located in the heart that sends out signals to keep the heart beating regularly
7. powerhouse of the cell; 10x more abundant in cardiac muscle cells to keep the heart from getting tired
8. specialized connections between cardiac muscle cells
10. the ends of the sarcomere that are "zig-zaggy" and separate each sarcomere
11. muscles that do not have sarcomeres, therefore do not appear to have parallel lines or sarcomeres
13. inability of muscle to maintain force of contraction after prolonged activity
15. a unit of a striated muscle fiber that causes the muscle to contract
20. a muscle that straightens a joint
21. more than one nucleus per cell; skeletal muscle