Muscular System

4. Neurotransmitter that stimulates a skeletal muscle fiber
5. Imparts the reddish-brown color of skeletal muscle tissue
7. Extend inward from the epimysium and separate the muscle tissue into fascicles
9. The functional connection between a neuron and another cell
10. Increase in the number of motor units being activated during a contraction
12. Dense connective tissue that separates an individual skeletal muscle from adjacent muscles and holds it in position
14. Bundles of skeletal muscle fibers
15. Enlarged portions of the sarcoplasmic reticulum

1. Layer of connective tissue that closely surrounds each skeletal muscle
2. Striations of skeletal muscle result from a repeating pattern
3. Broad fibrous sheets that may attach to bone, skin, or to be the connective tissue of adjacent muscles
6. Connect the opposing ends of cardiac muscles
8. Layer of connective tissue that allows parts to move somewhat independently
11. Play a fundamental role in muscle contraction and have to kinds of protein filaments
13. Protein responsible for the red color of blood