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| 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. Picture Stats: Views: 96 Filesize: 841.69kB Height: 1115 Width: 1799 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=48179 |