Muscular System Remembering Project

5. connective tissue layer surrounding each fascicle.
11. the amount of extra oxygen that must be taken in after exercise to restore muscles to their resting state.
12. muscle contraction in which the muscle generates tension without changing length.
13. a single muscle cell; long and cylindrical in a skeletal muscle.
14. the muscle primarily responsible for a movement.
16. connective tissue layer surrounding each muscle fiber.
17. a muscle that assists the agonist in performing its action.
18. a thread‑like structure inside a muscle fiber, composed of myofilaments.
22. striated involuntary muscle found only in the heart.
23. connective tissue layer surrounding the entire skeletal muscle.
25. a sheet of fibrous connective tissue that separates muscles and may surround muscles or muscle groups.

1. voluntary muscle attached to bones, enabling movement of the skeleton.
2. the less movable (fixed) end of the muscle attachment.
3. muscle contraction in which the muscle changes length (shortens or lengthens) while the tension stays constant.
4. the contractile filaments (actin and myosin) within a myofibril.
6. the minimum level of stimulus required to cause a muscle fiber to contract.
7. a recording of a muscle contraction showing latent period, contraction phase, and relaxation phase.
8. the functional unit of a myofibril, from one Z‑line to the next, where contraction occurs.
9. the more movable end of the muscle attachment that moves toward the origin during contraction.
10. the response of a single muscle fiber to a single stimulus: contraction followed by relaxation.
15. involuntary muscle found in walls of hollow organs (e.g., intestines, blood vessels).
19. a bundle of muscle fibers within a skeletal muscle.
20. the muscle that opposes the action of the agonist.
21. the cell membrane of a muscle fiber.
24. one motor neuron and all the muscle fibers it controls.