Across
- 2. _____-twitch muscles can work for a long time, so they are good for distance running and biking
- 3. Cardiac muscles spread _____ throughout the human body
- 5. Muscles that do not require a person to think
- 7. Muscle in a person's chest
- 10. Muscles located in the hollow organs
- 11. Attach muscles to the bones
- 12. Muscles work by _______
Down
- 1. The brain sends messages to muscles through these
- 2. Muscles that help a human move
- 4. Muscles break down food through this system
- 6. Muscles are made of special _____ that are threads of long, skinny cells
- 8. _____-twitch muscles are good for quick blasts of speed or strength
- 9. A person has to think about moving these muscles