Muscle Anatomy

2. The proper name for the cell membrane of a muscle cell.
5. The portion of the sarcolemma that is directly across from the neuron (three words, no space).
7. Muscle cells are also known as muscle __________(plural).
8. This is released into the synaptic cleft by the terminal knobs of a neuron.
11. In the sarcomere, he ___________ contains only thin filaments and appears lighter (two terms, no space).
13. This molecule covers the active sites on actin.
16. The tissue surrounding each muscle cell is called what?
17. This molecule has heads that attach to the other molecule and rotate, providing movement.
18. The space between the terminal knob of the neuron and the sarcolemma of the muscle cell (two words, no space).
19. This is the center of the sarcomere (two terms, no space).
20. __________ muscle cells contain one or two nuclei, appear branched, and are striped.
21. __________ muscle cells contains multiple nuclei, are long and straight, and appear striped.
23. This is released by the sarcoplasmic reticulum, into the sarcoplasm.

1. Fascicles are surrounded by what layer?
3. Breaking apart this molecule provides energy for the cell.
4. This is the most superficial layer of a muscle.
5. Thick and thin filaments are both what (plural)?
6. Myosin is the ___________ filament.
9. In the sarcomere, the ___________ contains both thick and thin filaments and appears darker (two terms, no space).
10. The basic unit of a muscle cell is a what?
12. The place where there is interaction between the neuron and the muscle cell is called the what? (two words, no space).
13. This molecule binds calcium and changes shape, helping to reveal active sites.
14. Actin is the __________ filament.
15. This is an invagination of the sarcolemma (two terms, no space or punctuation).
22. This forms the boundary between two sarcomeres (two terms, no space).