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SlideshowReport

Coelomate Body Plan: Earthworm

Description
How earthworms move through soil. (a) Bristles on sides of the body extend and withdraw as muscle contractions act on coelomic fluid inside each segment. (b) Bristles are extended when a segment’s diameter is at its widest (when circular muscle is relaxed and longitudinal muscle is contracted). They retract as the segment gets long and thin. A worm’s front end is pushed forward, then bristles anchor it and the back of the body is pulled up behind it.
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