Muscle System Key Terms

2. minimum amount of energy needed to make a muscle fiber contract
4. Muscles found in the walls of internal organs that are involuntary and non-striated
7. Muscles found in the walls of the heart they are striated and involuntary
9. The attachment site that doesn’t move during muscle contractions
11. The muscle that is contracting during a muscle contract
18. A synaptic connection between the terminal end of a motor nerve and a muscle
19. A layer of connective tissue that ensheaths each individual muscle fiber
22. The dense connective tissue that surrounds the entire muscle tissue.
23. A tough, sheet like membrane that covers and protects the muscle tissue
24. The tension or resistance in the relaxed muscle
25. A thin sheath of connective tissue found on the surface of muscles, they are continuous with external tendons

1. A fibrous connective tissue that attaches muscle to bone.
3. Basic rod-like organelle of a muscle cell.
5. A excitatory neurotransmitter that carries messages to the brain to start muscle contractions to move your muscles.
6. Muscle that assist the agonist muscle for a specific action at a joint
8. An instrument that measures the amount of tension produced over time
10. Muscles attached to bones that have voluntary movements and are striated
12. Neuronal cells located in the central nervous system controlling a variety of downstream targets.
13. A large abundant protein of striated muscles, helps stabilize the thick filaments.
14. The main contractile unit of muscle fiber in the skeletal muscles.
15. Occurs when one muscle fiber contracts in response to a stimulus by the nervous system
16. Small muscles that act to keep bones immobile when needed.
17. 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 muscle that relaxes or lengthens during a muscle contraction
21. A protein that is an important contributor to the contractile property of muscles.