The Skeletal System

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Across
  1. 4. What red blood cells use for energy in the place of a mitochondria. (7)
  2. 5. The muscle that is controlling the major action in a contraction. (7)
  3. 7. The protective sheath of the muscle. (10)
  4. 8. Type of muscle fibres that fatigue easily. (4,5)
Down
  1. 1. One of the filaments that cause muscle contraction. (6)
  2. 2. Scientific name for a front-line white blood cell. (10)
  3. 3. How white blood cells move throughout the body. (13)
  4. 6. The strongest muscle in the body. (5)
  5. 9. What connects the muscle to the bone. (6)
  6. 10. The type of muscle that moves involuntarily. (7)