Muscular System

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Across
  1. 2. Muscle sub-group: produces movement, helps sustain posture, helps stabilize joints.
  2. 3. Muscles that contract or move without conscious control.
  3. 4. Skeletal muscles that contract and relax under conscious control.
  4. 6. Tissue that connects muscle to the bone
  5. 7. Muscle sub-group: makes up the middle, thick layer of the heart. Helps make the heart contract and pump blood.
Down
  1. 1. The tightening, shortening, or lengthening of muscles during an activity.
  2. 2. Muscle sub-group: found in the walls of hollow internal organs, cannot be controlled and acts involuntarily.
  3. 5. Chemical your body produces when your cells break down carbohydrates for energy. Responsible for muscle fatigue.