Muscular System

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