| 21. | The muscles then contract through the sliding filament mechanism, causing shortening of sarcomeres and muscle contraction.
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| 22. | Release of sarcomeres of the muscles to shorten, thus leading to the contraction of the muscle.
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| 23. | Myofibrils are complex strands of several kinds of protein filaments organized together into repeating units called sarcomeres.
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| 24. | Muscle tone or firmness is derived from the increase in actin and myosin cross filaments in the sarcomere.
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| 25. | The alpha actins are found in muscle tissues and are a major constituent of the sarcomere contractile apparatus.
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| 26. | The striated appearance of both skeletal and cardiac muscle results from the regular pattern of sarcomeres within their cells.
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| 27. | These rods are non-pathognomonic structures that have a similar composition to the Z disks found in the sarcomere.
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| 28. | Each muscle fiber contains myofibrils, which are very long chains of sarcomeres, the contractile units of the cell.
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| 29. | It limits the range of motion of the sarcomere in tension, thus contributing to the passive stiffness of muscle.
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| 30. | This is because the sarcomere length, which is the fundamental unit of muscle structure, is similar in length.
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