Muscles

3. the muscle on the back of the upper arm
11. a protein that converts chemical energy in the form of ATP to mechanical energy
12. a system of membrane-bound tubules that surrounds muscle fibrils
14. A dark thin protein band to which actin filaments are attached in a striated muscle fiber
17. plays an important role in signal transduction pathways,where they act as a second messenger, in neurotransmitter release from neurons, contraction of all muscle cell types
18. the tough tissue that cushions bones at their joints
20. the tissue that joins bones together at joints
22. a complex of three regulatory proteins that is integral to muscle contraction in skeletal muscle and cardiac muscle

1. the large muscle in the upper arm that flexes the forearm
2. it is composed of thin filaments of actin and thick filaments of myosin
3. a two-stranded alpha-helical coiled coil protein found in cell cytoskeletons
4. the cell membrane of a striated muscle fiber cell
5. the contractile unit of a myofibril
6. a closed cavity containing synovial fluid
7. a globulin that is present in muscle plasma and that in connection with myosin plays an important role in muscle contraction
8. the bone in the forearm that's on the outside when you flex
9. the joint that allows bones to move on many planes
10. the joint where the bones can only move along one axis
13. A region of myosin molecules that extend from the surface of the thick filaments toward the thin filaments in a skeletal muscle
15. the bone in the forearm that's on the inside when you flex
16. the bone in the upper arm that goes from the shoulder to the elbow
19. the tissue that attaches muscle to bone
21. fiber the type of cell found in muscle tissue