Down
| 2. | strong muscle that moves up and down as you breathe |
| 3. | muscle which straightens part of the body |
| 6. | muscles that work with bones of the skeleton. They look striated under the microscope. They help you to walk, run, jump, or kick. (2 words) |
| 7. | fast and constant physical activity that increases the oxygen supply to the muscles (2 words) |
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Across
| 1. | the heart. It constantly contracts and relaxes to pump blood around your body. It is involuntary. It never gets tired. (2 words) |
| 4. | waste produced when muscles contract. It can cause cramps. (2 words) |
| 5. | painful muscle condition that can result if you use a muscle too much and tear muscle fibers (2 words) |
| 8. | weaker muscle, but does allow for a wide range of movement. One moves the hyoid bone in the throat. (2 words) |
| 9. | collection of organs whose primary function is movement (2 words) |
| 10. | muscles that have a tendon at each end, but at one end are attached by fascicles (2 words) |
| 11. | biggest muscle in the body. It is located in the buttocks. (2 words) |
| 12. | physical activity, such as push-ups or curl-ups, which is the most effective exercise to develop the size and strength of skeletal muscles (2 words) |
| 13. | bundles of long, thin cells that make up muscles (2 words) |
| 14. | cells that carry signals from the brain |
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