Muscle System Key Terms

2. The muscle that is contracting during a muscle contract
9. A protein that is an important contributor to the contractile property of muscles.
10. A large abundant protein of striated muscles, helps stabilize the thick filaments.
13. A excitatory neurotransmitter that carries messages to the brain to start muscle contractions to move your muscles.
14. Neuronal cells located in the central nervous system controlling a variety of downstream targets.
16. The prototype of a molecular motor, a protein that converts chemical energy in the form of ATP to mechanical energy, generating force and movement
20. The dense connective tissue that surrounds the entire muscle tissue.
21. A thin sheath of connective tissue found on the surface of muscles, they are continuous with external tendons
23. A fibrous connective tissue that attaches muscle to bone.
25. Basic rod-like organelle of a muscle cell.

1. Muscles found in the walls of internal organs that are involuntary and non-striated
3. Muscles found in the walls of the heart they are striated and involuntary
4. Muscles attached to bones that have voluntary movements and are striated
5. The attachment site that doesn’t move during muscle contractions
6. Occurs when one muscle fiber contracts in response to a stimulus by the nervous system
7. An instrument that measures the amount of tension produced over time
8. The muscle that relaxes or lengthens during a muscle contraction
11. minimum amount of energy needed to make a muscle fiber contract
12. A layer of connective tissue that ensheaths each individual muscle fiber
15. A synaptic connection between the terminal end of a motor nerve and a muscle
17. The tension or resistance in the relaxed muscle
18. A tough, sheet like membrane that covers and protects the muscle tissue
19. Small muscles that act to keep bones immobile when needed.
22. Muscle that assist the agonist muscle for a specific action at a joint
24. The main contractile unit of muscle fiber in the skeletal muscles.