Muscular System -- 15 Puzzle Box

Instructions: Write the clue number given below in the correct corresponding box at left. When completed, the numbers in each row across and each column down will add up to 15 if all the answers are correct.

• 1. When given as part of the name of a muscle, it indicates a muscle that lifts.
• 2. Specialized cells in cardiac muscle tissue that initiate spontaneous contractions.
• 3. An activity that strengthens muscles.
• 4. A muscle protein that interacts with actin to produce muscle contraction.
• 5. Used to describe a pair of muscles that pull in opposite directions.
• 6. This type of muscle in vertebrates moves food along the digestive tract.
• 7. When given as part of the name of a muscle, it indicates a muscle that expands a part of the body.
• 8. This type of muscle is attached to bones via tendons.
• 9. Special organelles in muscle cells.

If you need help with any of the clues in the puzzle above, refer to the Human Muscular System and Naming and Examples of Human Muscles.

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