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| This model simulates a muscle contracting. The actin filaments "slide" past the myosin filaments when the muscle contracts (hence the name!). Even though the muscle is contracting or shortening, the actual length of the filaments remains the same. |
| The various positions of the proteins (relaxed, partially contracted, and contracted) during the sliding motion creates different visible banding patterns. Many years ago, scientists discovered these banding patterns and developed the term - striated muscles. |
| Finally, "bulges" in the muscle appear when the actin filaments are forced to overlap. This overlapping occurs when the myosin attaches to the actin and pulls towards the center of the sarcomere. Click here to see one myosin head grabbing hold of the actin filament. |
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