The Skeletal System
Across
- 8. The neurotransmitter that tells the muscle it's time to contract
- 9. Smooth and sustained contractions due to rapid stimulation of the muscle without relaxation
- 14. The cell membrane (plasma membrane) of a muscle cell
- 15. A single, brief jerky contraction of a muscle fiber
- 16. Increasing the angle between two bones beyond 180 degrees
- 17. Increasing the angle between two bones
- 19. The functional unit of skeletal muscle
- 21. Type of muscle contraction in which the length of the muscle stays the same but the tension increases
- 22. The myofilament attached at the Z line
- 23. A cord-like connecting structure created by the epimysium fusing together at the end of a muscle
- 27. The high energy molecule that fuels muscle contraction
- 28. The myofilament attached at the M line
- 30. The forearm rotates laterally so the palm faces anteriorly (or up)
- 33. A sheet-like connecting structure created by the epimysium fusing together at the end of a muscle
- 37. Acetylcholine binds to a _________ on the muscle fiber's sarcolemma
- 38. A molecule that can hold extra phosphate like a "backup battery"
- 39. Elevating the foot so that the superior surface approaches the shin
- 40. Muscle tone is the state of continuous partial _________
- 41. Turning the sole of the foot outward
- 42. The chemical that causes the regulatory elements to move away from actin
Down
- 1. Type of muscle with intercalated disc and branching cells
- 2. Decreasing the angle between two bones
- 3. The forearm rotates medially so the palm faces posteriorly (or down)
- 4. The only type of muscle that is voluntary
- 5. The body system that controls the muscular system
- 6. The long strands of proteins inside muscle fibers
- 7. Moving a limb away from the midline
- 10. The connective tissue covering of a muscle
- 11. The band that gets smaller when a muscle contracts (also called the I band)
- 12. Muscle cells are so long and thin they are called muscle ______
- 13. Turning the sole of the foot inward
- 18. The band that contains both actin and myosin
- 20. Actin and myosin are examples of this
- 22. Moving a limb toward the midline
- 24. The connective tissue covering of a muscle fiber
- 25. Pointing the toes away from the head is called _____ flexion
- 26. The type of muscle with the slowest contractions
- 29. Where a neuron and muscle fiber synapse (meet) is called a _____ junction
- 31. A bundle of muscle fibers
- 32. One neuron and all of the muscle fibers it synapses with is called a _____ unit
- 34. Type of muscle contraction in which the length of the muscle changes but the tension stays the same
- 35. The connective tissue covering of a fascicle
- 36. An bag-like organelle that holds substances (such as acetylcholine) inside a cell