B3.3

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Across
  1. 3. Cylindrical structures inside a muscle fiber made of sarcomeres.
  2. 5. The flexor muscle that bends the arm when it contracts.
  3. 7. The thick protein filament that pulls on actin to cause contraction.
  4. 11. The thigh bone which acts as a lever for moving the lower limb.
  5. 12. Muscles that work in opposite pairs where one contracts while the other relaxes.
  6. 13. The specialized endoplasmic reticulum that stores calcium ions in muscle.
  7. 15. The action of straightening a joint that increases the angle between bones.
  8. 16. The specialized plasma membrane of a muscle fiber.
  9. 17. The hip bone that provides an anchorage point for the leg muscles.
Down
  1. 1. The functional unit of contraction between two Z-lines.
  2. 2. The action of bending a joint that decreases the angle between bones.
  3. 4. The tough connective tissue that joins bone to bone.
  4. 6. The smooth tissue that covers the ends of bones to reduce friction.
  5. 8. The extensor muscle that straightens the arm when it contracts.
  6. 9. The boundaries of a sarcomere where actin filaments are attached.
  7. 10. The connective tissue that joins muscle to bone.
  8. 13. The fluid that lubricates the joint to allow for easy movement.
  9. 14. The thin protein filament found within a sarcomere.