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Heavy use doesn't wear muscles out; instead they grow bigger and stronger. Note: NASA astronauts don't need to be this buff.
This image is public domain because it was published by NASA
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 19:50, 25 October 2007 | |
270 × 261 (190 KB) | Tian-yi (Talk | contribs) | |
| 19:41, 25 October 2007 |  |
113 × 109 (36 KB) | Tian-yi (Talk | contribs) | Heavy use doesn't wear muscles out; instead they grow bigger and stronger. | |
| 19:30, 25 October 2007 |  |
175 × 120 (32 KB) | Tian-yi (Talk | contribs) | ||
| 19:29, 25 October 2007 |  |
100 × 69 (13 KB) | Tian-yi (Talk | contribs) | The muscular system is composed of specialized cells called muscle fibers. Their predominant function is contractibility. Muscles, where attached to bones or internal organs and blood vessels, are responsible for movement. Nearly all movement in the body |
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