Muscle System Key Terms

1. A layer of connective tissue that ensheaths each individual muscle fiber
3. The muscle that relaxes or lengthens during a muscle contraction
6. Muscles attached to bones that have voluntary movements and are striated
7. The dense connective tissue that surrounds the entire muscle tissue.
11. Basic rod-like organelle of a muscle cell.
12. Muscle that assist the agonist muscle for a specific action at a joint
13. Occurs when one muscle fiber contracts in response to a stimulus by the nervous system
14. A protein that is an important contributor to the contractile property of muscles.
15. Muscles found in the walls of internal organs that are involuntary and non-striated
16. A synaptic connection between the terminal end of a motor nerve and a muscle
18. The main contractile unit of muscle fiber in the skeletal muscles.
20. Neuronal cells located in the central nervous system controlling a variety of downstream targets.
22. A thin sheath of connective tissue found on the surface of muscles, they are continuous with external tendons
23. A large abundant protein of striated muscles, helps stabilize the thick filaments.
24. Small muscles that act to keep bones immobile when needed.

2. An instrument that measures the amount of tension produced over time
4. minimum amount of energy needed to make a muscle fiber contract
5. A excitatory neurotransmitter that carries messages to the brain to start muscle contractions to move your muscles.
8. A tough, sheet like membrane that covers and protects the muscle tissue
9. The prototype of a molecular motor, a protein that converts chemical energy in the form of ATP to mechanical energy, generating force and movement
10. The tension or resistance in the relaxed muscle
13. A fibrous connective tissue that attaches muscle to bone.
17. Muscles found in the walls of the heart they are striated and involuntary
19. The muscle that is contracting during a muscle contract
21. The attachment site that doesn’t move during muscle contractions